• Affect/effect
• Among/between
• Both
• Can/may
• Compared with/compared to
• Due to
• Case, patient
• Dependant/dependent
• Fewer/less
• Former/latter
• Included
• Led/lead
• Licence/license
• May/might
• Neither/nor
• Practice/Practise
• That/which
• Utilise/usage

Affect/effect

• Affect as a verb means to have influence on. Effect as a verb means to bring about or cause
• Affect as a noun refers to an immediate emotion. Effect as a noun means result
  Injecting ascorbic acid may affect his recovery
  In the drug-treatment group, constipation, headache and nausea were the most commonly reported adverse effects

Among/between

• Use between when referring to two items and among for more than two
  There were no differences among the three treatments studied

Both

• Both is used only when discussing two things, e.g.
  Patients reported both headaches and nausea
  ‘Patients reported both headaches, nausea and dizziness’ would be wrong

Can/may

• Can is used for things that are possible. May is used for what is permissible

Compared with/compared to

• ‘Compare to’ should be used to liken things (a simile), ‘compare with’ to consider their similarities or differences. Compare with is usually the term required
  Shall I compare thee to a bunch of grapes?
  Oasis have often been compared to Blur
  The low-fat diet was compared with the high-fat diet

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Due to

• Due is an adjective only and must always modify a noun. Thus 'He was absent due to illness' would be wrong and should be corrected either by writing 'He was absent because of [or owing to] illness' or by writing the sentence in such a way as to give due a noun to modify, e.g. 'His absence was due to illness'

Case, patient

• A case is a particular instance of disease. A patient is a person who is ill. A case is evaluated and reported but does not have symptoms. A patient is admitted to the hospital, examined, given medication, recovers

Dependant/dependent

• Dependant is the noun (for example, a child is a dependant); something that depends on something else is dependent

Fewer/less

• Fewer is used for number (counted and countable items) and less for quantity (uncountable and uncounted quantities). e.g.
  fewer than nine items, fewer interventions, less than 300 g, less than 20%, less information, fewer interventions may not always mean less care

Former/latter

• Use former and latter only if you are referring to one of two previously mentioned items

Included

• Use included to introduce a list of criteria only if the list is not complete. Otherwise use 'the criteria were … '

Led/lead

• Led is the past tense of to lead. The spelling lead that is pronounced led is the metal

Licence/license

• Licence is the noun (the licence was issued last year) and license is the verb (the drug was licensed last year)

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May/might

• May is used if there is more than one possible outcome. Might is use to discuss something that could have happened but didn't because a condition for its happening was not fulfilled. For example:

  The mice might have been healthy if they had been given zinc

• May and might can also be used to indicate degrees of tentativeness

  The conclusion may be wrong

• The choice of may or might can change the meaning:

  Changing the insulin regimen might have saved the patient (the patient is dead, but if the insulin regimen had been changed, it is possible that the patient would have survived)

  Changing the insulin regimen may have saved the patient (implies that the patient survived, possibly because of the change in the regimen)

Neither/nor

• A sentence that contains neither must also include nor (the treatment was neither effective nor safe). 'Nor' can be used in a sentence that doesn't contain 'neither' (the drug should not be prescribed, nor should it be stored by the pharmacy)

Practice/Practise

• Practice is the noun (a doctor's practice). To practise is the verb (a doctor who practised medicine)

That/which

• A restrictive (or defining) clause 'completes' the subject and is consequently indispensable. By contrast, a non-restrictive (or commenting) clause does no more than give additional information. A non-restrictive clause should be within commas, a restrictive one should not

• 'That' introduces a restrictive clause (This is the house that Jack built); 'which' introduces a non-restrictive clause and is offset by commas (This house, which Jack built, was of shoddy construction)

Utilise/usage

• In its strictest sense, utilise means to make the best use of something that wasn't intended for the job ('He utilised a coat hanger to repair his car'). It can be legitimately extended to mean making the most practical use of something ('Although the hills were steep, the rice farmers utilised every square inch of the land'), but in all other senses 'use' is better

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