What's the difference between must and shall?

Must


Definition:

  • (v. i. / auxiliary) To be obliged; to be necessitated; -- expressing either physical or moral necessity; as, a man must eat for nourishment; we must submit to the laws.
  • (v. i. / auxiliary) To be morally required; to be necessary or essential to a certain quality, character, end, or result; as, he must reconsider the matter; he must have been insane.
  • (n.) The expressed juice of the grape, or other fruit, before fermentation.
  • (n.) Mustiness.
  • (v. t. & i.) To make musty; to become musty.

Example Sentences:

  • (1) Such a signal must be due to a small ferromagnetic crystal formed when the nerve is subjected to pressure, such as that due to mechanical injury.
  • (2) The catheter must be meticulously fixed to the skin to avoid its movement.
  • (3) The significance of minor increases in the serum creatinine level must be recognized, so that modifications of drug therapy can be made and correction of possibly life-threatening electrolyte imbalances can be undertaken.
  • (4) One must be suspicious of any gingival lesion, particulary if there is a sudden onset of bleeding or hyperplasia.
  • (5) For assessment of clinical status, investigators must rely on the use of standardized instruments for patient self-reporting of fatigue, mood disturbance, functional status, sleep disorder, global well-being, and pain.
  • (6) To this figure an additional 250,000 older workers must be added, who are no longer registered as unemployed but nevertheless would be interested in finding another job.
  • (7) They had learned through hard experience what Frederick Douglass once taught -- that freedom is not given, it must be won, through struggle and discipline, persistence and faith.
  • (8) Careful attention must be given to antibiotic choice as well as the dose and duration of therapy.
  • (9) Before carrier vaccines are applied, these risks must be thoroughly evaluated case-by-case.
  • (10) This suggests that molars do not maintain a fixed relationship to incisors over time, and extreme care must be taken to standardize an experiment to a specific body weight when using this method.
  • (11) For retrospective action to be taken, and an FA charge to follow, the decision of the panel must be unanimous.” The match between the sides ended in acrimony and two City red cards.
  • (12) Although esmolol may be used as a primary hypotensive agent, the potential for marked myocardial depression must be recognized.
  • (13) After the diagnosis of a soft-tissue injury (sprain, strain, or contusion) has been made, treatment must include an initial 24- to 48-hour period of RICE.
  • (14) Since the plasmid-cured strains did not contain DNA sequences homologous to plasmid DNA, the gene for the free-inclusion protein must be encoded in the chromosome.
  • (15) If women psychiatrists are to fill some of the positions in Departments of Psychiatry, which will fall vacant over the next decade, much more attention must be paid to eliminating or diminishing the multiple obstacles for women who chose a career in academic psychiatry.
  • (16) Research must continue to determine the optimal regimen that suppresses testosterone activity with the least amount of toxicity.
  • (17) Renal arteriography is therefore alone capable of answering two primordial questions: "Must surgery be undertaken and when operating, what surgical tactics to adopt".
  • (18) Which must make yesterday's jobs figures doubly alarming for the coalition.
  • (19) It is commonly assumed that the visual resolution limit must be equal to or less than the Nyquist frequency of the cone mosaic.
  • (20) In assessing damaged nets and curtains it must be recognised that anything less than the best vector control may have no appreciable impact on holoendemic malaria.

Shall


Definition:

  • (v. i. & auxiliary.) To owe; to be under obligation for.
  • (v. i. & auxiliary.) To be obliged; must.
  • (v. i. & auxiliary.) As an auxiliary, shall indicates a duty or necessity whose obligation is derived from the person speaking; as, you shall go; he shall go; that is, I order or promise your going. It thus ordinarily expresses, in the second and third persons, a command, a threat, or a promise. If the auxillary be emphasized, the command is made more imperative, the promise or that more positive and sure. It is also employed in the language of prophecy; as, "the day shall come when . . . , " since a promise or threat and an authoritative prophecy nearly coincide in significance. In shall with the first person, the necessity of the action is sometimes implied as residing elsewhere than in the speaker; as, I shall suffer; we shall see; and there is always a less distinct and positive assertion of his volition than is indicated by will. "I shall go" implies nearly a simple futurity; more exactly, a foretelling or an expectation of my going, in which, naturally enough, a certain degree of plan or intention may be included; emphasize the shall, and the event is described as certain to occur, and the expression approximates in meaning to our emphatic "I will go." In a question, the relation of speaker and source of obligation is of course transferred to the person addressed; as, "Shall you go?" (answer, "I shall go"); "Shall he go?" i. e., "Do you require or promise his going?" (answer, "He shall go".) The same relation is transferred to either second or third person in such phrases as "You say, or think, you shall go;" "He says, or thinks, he shall go." After a conditional conjunction (as if, whether) shall is used in all persons to express futurity simply; as, if I, you, or he shall say they are right. Should is everywhere used in the same connection and the same senses as shall, as its imperfect. It also expresses duty or moral obligation; as, he should do it whether he will or not. In the early English, and hence in our English Bible, shall is the auxiliary mainly used, in all the persons, to express simple futurity. (Cf. Will, v. t.) Shall may be used elliptically; thus, with an adverb or other word expressive of motion go may be omitted.

Example Sentences:

  • (1) Before leaving New York on Wednesday, Charlie Chaplin said: “I shall probably be away for six months, but no more, for I have definite plans for my next film.
  • (2) According to the quantitative analysis between threshold titers of skin test and RAST titers using house dust and HD mites allergens, specific IgE production shall be decreased in the patients over 40 years old.
  • (3) We shall not decide the future of Britain's relationship with the EU.
  • (4) A survey shall be given on the physiological, pathophysiological and pharmacotherapeutic backgrounds of the biogenic amine 5-hydroxytryptamine (serotonin; 5HT), to be preceded by a few historical remarks.
  • (5) His line on white privilege is ace: “There ain’t a white man in this room that would change places with me,” he says on his DVD Bigger & Blacker , then adds gleefully, “And I’m rich!” He makes lots of films, too, but as is often the way with comedians, those are, shall we say, less gilded affairs.
  • (6) It is hoped that further biochemical studies shall confirm these groupings at a more fundamental level and eventually a system recognising the double-stranded RNA gene product relationships shall evolve.
  • (7) There may be cases in which youngsters have travelled overseas perhaps out of curiosity or with an interest but upon arriving shall we say in Turkey, through which a lot of these people are staged, get cold feet and decide they don’t want to pursue that objective.
  • (8) Within the scope of this paper I shall also attempt a brief description of the focal problems, examined, their operationalization in research methods, expected results, and a preliminary discussion of three demonstrative cases.
  • (9) In order to study the possible role of fibroblastic biological changes in periodontal disease, later on we shall compare the characteristics of normal fibroblast to those of fibroblast taken in periodontal disease.
  • (10) OK, I have a long experience in football but there are players who don’t have the [same] experience, so it shall have an influence.
  • (11) So a striker needs also a bit of luck and then the confidence is higher but he’s self-confident so I expect he shall score and maybe against Chelsea .” So far Van Persie has remained injury free, which is a fillip after previously admitting to managing persistent issues for years.
  • (12) In a 1958 debate on marriage, Robert Menzies himself that declared that the issue “closely touches the individual conscience of members”, adding that “though it will be a government measure, it shall not be treated as a party measure”.
  • (13) The surgical treatment of the chronic pancreatitis shall concerning indication to operation, tactics and kind of intervention always take into consideration an existing abuse of alcohol.
  • (14) Agreement on Japan, 11 February The leaders of the three great powers – the Soviet Union, UK and US – have agreed that after the war in Europe is terminated, the Soviet Union shall enter into war against Japan on the side of the allies on condition that: The status quo in Outer Mongolia shall be preserved.
  • (15) All rights reserved 'From Malta to Yalta': leaders in high spirits 1 January 1945 Prime minister to president and top secret We shall be delighted if you will come to Malta.
  • (16) Qualifying for insurance benefits requires that this activity shall have been finally given up and that the same or other hazardous activities are avoided in the future.
  • (17) So I shall break my cover and, for the first time ever, reveal this top secret dossier: “Welcome to Britain, Visitor!
  • (18) "I do not decide that skirts shall be short or long.
  • (19) We shall continue our measurements, particularly those of activity in persons, and doubtless we shall refine our estimates of collective dose, but they are unlikely to change significantly.
  • (20) More specifically I shall discuss how the distribution of the control of fluxes, concentrations and potentials, among the various enzymes (catalysts) in these systems has been measured and how this distribution can be understood in terms of the enzyme properties.