What's the difference between happen and occur?

Happen


Definition:

  • (v. i.) To come by chance; to come without previous expectation; to fall out.
  • (v. i.) To take place; to occur.

Example Sentences:

  • (1) He is also the foremost theorist of the Tijuana-San Diego border in terms of what happens when the urban culture of the developing world collides with that of the developed world.
  • (2) Would people feel differently about it if, for instance, it happened on Boxing Day or Christmas Eve?
  • (3) "At the same time, however, we cannot allow one man's untrue version of what happened to stand unchallenged," he said.
  • (4) I think part of it is you can either go places where that's bound to happen.
  • (5) These results do not support the view that in the rat pheromones from adult males enhance puberty in females, contrary to what is known to happen in the mouse.
  • (6) The only way we can change it, is if we get people to look in and understand what is happening.” Facebook Twitter Pinterest Dean, Clare and their baby son.
  • (7) That is what needs to happen for this company, which started out as a rebellious presence in the business, determined to get credit for its creative visionaries.
  • (8) "David Cameron has lost control of what's happening in the NHS.
  • (9) The small print revealed that Osborne claimed a fall in borrowing largely by factoring in the proceeds of a 4G telecomms auction that has not yet happened.
  • (10) She was clearly elected on a pledge not to cut school funding and that’s exactly what is happening,” Corbyn said.
  • (11) Urban hives boom could be 'bad for bees' What happened: Two professors from a University of Sussex laboratory are urging wannabe-urban beekeepers to consider planting more flowers instead of taking up the increasingly popular hobby.
  • (12) It happens to anyone and everyone and this has been an 11-year battle.” Emergency services were called to the oval about 6.30pm to treat Luke for head injuries, but were unable to revive him.
  • (13) One might expect that a similar news spike and rebounding of support for stricter gun control can happen, given President Obama's new push.
  • (14) At present, fewer than 20% do so, with more than half of all deaths happening in hospital and the rest in hospices or care homes.
  • (15) It mostly happens to strong men whose biceps muscle are contracted and overstretched unexpectedly.
  • (16) However, I’m behaving as if it’s all going to happen as planned.” It has certainly been a long road to production.
  • (17) There is no evidence to support the move to seven-day services, there is no evidence of what is going to happen if we divert our resources away from the week to weekends.
  • (18) Some factors of resistance (such as side benefits) happen in reactive and neurotic depressions and are independent of the pharmacological action.
  • (19) It is important for this commission to get to the truth of what happened and it's able to carry on without interference and disruption.
  • (20) And would all Labour cabinet ministers be as willing to work closely with Lib Dem ministers of state, as happens now, though with some spiky exceptions?

Occur


Definition:

  • (v. i.) To meet; to clash.
  • (v. i.) To go in order to meet; to make reply.
  • (v. i.) To meet one's eye; to be found or met with; to present itself; to offer; to appear; to happen; to take place; as, I will write if opportunity occurs.
  • (v. i.) To meet or come to the mind; to suggest itself; to be presented to the imagination or memory.

Example Sentences:

  • (1) Once treatment began, no significant changes occurred in Group 1, but both PRA and A2 rose significantly in Groups 2 and 3.
  • (2) Direct fetal digitalization led to a reduction in umbilical artery resistance, a decline in the abdominal circumference from 20.3 to 17.8 cm, and resolution of the ascites within 72 h. Despite this dramatic response to therapy, fetal death occurred on day 5 of treatment.
  • (3) Patients with papillary carcinoma with a good cell-mediated immune response occurred with much lower infiltration of the tumor boundary with lymphocyte whereas the follicular carcinoma less cell-mediated immunity was associated with dense lymphocytic infiltration, suggesting the biological relevance of lymphocytic infiltration may be different for the two histologic variants.
  • (4) It is concluded that during exposure to simulated microgravity early signs of osteoporosis occur in the tibial spongiosa and that changes in the spongy matter of tubular bones and vertebrae are similar and systemic.
  • (5) HSV I infection of the hand classically occurs in children with herpetic stomatitis and in health care workers infected during patient care delivery.
  • (6) Such an increase in antibody binding occurred simultaneously with an increase in the fluidity of surface lipid regions, as monitored by fluorescence depolarization of 1-(trimethylammoniophenyl)-6-phenyl-1,3,5-hexatriene.
  • (7) As far as acrophase table is concerned for all enzymes and fractions the acrophase occurred during the night.
  • (8) Electronmicroscopical investigations have revealed that, under normal conditions, a minor vesicular transfer of intravenously injected peroxidase occurs across the endothelium in segments of arterioles, capillaries and venules, especially in arterioles with a diameter about 15-30 mu.
  • (9) No significant change occurred in the bacterial population of our hospital unit during the period of the study (more than 3 years).
  • (10) The highest rate of discontinuation occurred when method choice was denied in the presence of husband-wife agreement on method choice, and the lowest rate occurred when method choice was granted in the presence of such concurrence.
  • (11) The secondary leukemia that occurred in these patients could be distinguished from the secondary leukemia that occurs after treatment with alkylating agents by the following: a shorter latency period; a predominance of monocytic or myelomonocytic features; and frequent cytogenetic abnormalities involving 11q23.
  • (12) An inflammatory process than occurs in the airways that is characterized by an influx of eosinophils and neutrophils into the airway epithelium and bronchial fluids.
  • (13) A clinical and microbiologic response occurred when anticoagulation therapy with heparin was added to the treatment regimen.
  • (14) Infection with opportunistic organisms, either singly or in combination, is known to occur in immunocompromised patients.
  • (15) A commensurate rise in both smoking and adenocarcinoma has occurred in the Far East where the incidence rate (40%) is twice that of North America or Europe.
  • (16) As prolongation of the action potential by TEA facilitates preferentially the hormone release evoked by low (ineffective) frequencies, it is suggested that a frequency-dependent broadening of action potentials which reportedly occurs on neurosecretory neurones may play an important role in the frequency-dependent facilitation of hormone release from the rat neurohypophysis.
  • (17) The role of O2 free radicals in the reduction of sarcolemmal Na+-K+-ATPase, which occurs during reperfusion of ischemic heart, was examined in isolated guinea pig heart using exogenous scavengers of O2 radicals and an inhibitor of xanthine oxidase.
  • (18) Angle closure glaucoma is a well-known complication of scleral buckling and it is of particular interest when it occurs in eyes with previously normal angles.
  • (19) The concentrations of five normally occurring protease inhibitors in serum and synovial fluid were compared in patients with rheumatoid arthritis, osteoarthrosis, and normal controls.
  • (20) A strong block to the elongation of nascent RNA transcripts by RNA polymerase II occurs in the 5' part of the mammalian c-fos proto-oncogene.