What's the difference between have and must?

Have


Definition:

  • (v. t.) To hold in possession or control; to own; as, he has a farm.
  • (v. t.) To possess, as something which appertains to, is connected with, or affects, one.
  • (v. t.) To accept possession of; to take or accept.
  • (v. t.) To get possession of; to obtain; to get.
  • (v. t.) To cause or procure to be; to effect; to exact; to desire; to require.
  • (v. t.) To bear, as young; as, she has just had a child.
  • (v. t.) To hold, regard, or esteem.
  • (v. t.) To cause or force to go; to take.
  • (v. t.) To take or hold (one's self); to proceed promptly; -- used reflexively, often with ellipsis of the pronoun; as, to have after one; to have at one or at a thing, i. e., to aim at one or at a thing; to attack; to have with a companion.
  • (v. t.) To be under necessity or obligation; to be compelled; followed by an infinitive.
  • (v. t.) To understand.
  • (v. t.) To put in an awkward position; to have the advantage of; as, that is where he had him.

Example Sentences:

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.