1.

accept, except.    Accept is a verb : except is a preposition

They accepted my invitation.

Everyone attended the meeting except the secretary.

2.

advice, advise.   Advice is a noun; advise is a verb.

His advice was useful.

I was advised to purchase a more economical car.

3.

affect, effect.   Affect is a verb; it means " to influence."   Effect may be a verb or a noun. The verb effect means " to cause to happen "; the noun effect means " the result."

Pollution affects everyone.

Your tears do not affect me.

Your tears have no effect upon me.

Doctors have effected a cure for polio.

The effect of drugs is well known.

4.

almost, most.   Most is used to form the superlative; it is used to modify nouns. Almost is an adverb.

Most people are honest.

He is the most unusual person I have ever met.

Almost everyone has a desire to succeed.

Almost all of the food was eaten.

5.

already, all ready.   Already means " before the time specified. " All ready means " completely prepared."

The movie had already begun by the time we arrived.

The members were all ready to hear the report.