Remember that a spell-checker won’t help with homonyms, words that sound alike but have different spellings and meanings. Some words that can cause trouble are listed below.

* their (possessive form of they)
* there (in that place)
* they’re (contraction of they are)

* accept (a verb, meaning to receive or to admit to a group)
* except (usually a preposition, meaning but or only)

* who’s (contraction of who is or who has)
* whose (possessive form of who)

* its (possessive form of it)
* it’s (contraction of it is or it has)

* your (possessive form of you)
* you’re (contraction of you are)

* affect (usually a verb, meaning to influence)
* effect (usually a noun, meaning result)

* than (used in comparison)
* then (refers to a time in the past)

* were (form of the verb to be)
* we’re (contraction of we are)
* where (related to location or place)