1.	Verbs tell time: We usually determine from the verb whether an event happened in the past, is happening now, or is at some other time.
	There are several "times" that can apply to a verb form: future, future perfect etc.
	But, for the most part, it seems to work well to be aware of present, past, and past participle.
	THESE ARE CALLED TENSE.
2.	Putting verbs into their possible tenses is called CONJUGATION.
3.	TENSES
	a.	PRESENT TENSE
		When we speak of something that is happening now, we use the present tense.
			1)	I hear.
			2)	You whistle.
			3)	You go.
		HINT: Sometimes verbs require an "s" ending in the present tense.
			1)	She hears.
				The present tense also can use the "ing".
			1)	She is walking.
		NOTICE: The "ing" verb has a helper.
	b.	PAST TENSE When we speak of something that happened in the past, we use the past tense.
		To form the past tense of regular verbs, we merely add "d" or "ed" to the present tense.
			1)	I heard.
			2)	You whistled.
	NOTE: Remember that irregular verbs usually change form from present to past.
			1)	He went.
	c.	PAST PARTICIPLE
		The past participle is another form of past. It uses the helper as its point of concern.
		When dealing with regular verbs, you take the past and add a helper to form the past participle.
			1)	I have heard.
			2)	She has whistled.
		REMEMBER: The irregular verb uses the helper but also, usually, changes the form of the verb from past to past participle.
			1)	He has gone.
4.	In order to understand tense easier, it seems necessary to know the meaning of a regular verb and irregular verb.
	a.	REGULAR VERB
		A regular verb is one which goes from present, to past, to past participle while retaining the root word.

		walk	walked	have walked
	b.	IRREGULAR VERB
		An irregular verb is one which changes form when it is conjugated.
		go	went	have gone

Irregular Verb List

Because irregular verbs seems to be a greater problem to conjugate thean regular verbs, here is a list of some irregular verbs which might give you trouble.