by It Was the Best of Sentences, It Was the Worst of Sentences (mobi)
accept / except: You accept a gift. When you except something, you leave it out.
compliment / complement: A flattering remark is a compliment. Something that completes something else, the way the right wine completes a meal, complements it.
affect / effect: Affect is usually a verb: That doesn't affect me. Effect is usually a noun: What will the effect of his decision be? Two rare synonyms defy this guideline. The transitive verb effect means "bring about": The candidate promised to effect positive change. The noun affect is a psychology term for emotion or a facial or bodily expression of emotion: The patient's affect was flat.
phase / faze: A phase is a stage of development. Faze is a verb meaning to upset or shock. Unfazed means unaffected.
led / lead: Led is the past tense form of the verb to lead: He led the horse to water. There is also the metal called lead, which is pronounced exactly like led.
then / than: Then is for time. Than is for comparison.
Computer's for sale / Merry Christmas from the Thompson's / other apostrophe errors: Never use an apostrophe to form a plural. It's Computers for sale and Merry Christmas from the Thompsons. Be especially careful with proper names ending in s.
grammar: Does not have an e in it.