what is the the diff betwwen the three:

Question

imperative, active and passive

Answer 1

imperative = command
as in "Go home!"

active = when the subject of a sentence or clause is doing the action of the verb
as in "John hit the baseball."

passive = when the subject of a sentence or clause is not doing the action of the verb
as in "The baseball was it by John."

Read and study about active and passive voice here:
http://grammar.ccc.commnet.edu/grammar/passive.htm

Read about moods of verbs here:
http://grammar.ccc.commnet.edu/grammar/verbs.htm#mood