Verbs - Tense Map

	SIMPLE	CONTINUOUS	PERFECT	PERFECT CONTIN.	
PRESENT	PRESENT SIMPLE

I study every day.	PRESENT CONTINUOUS

I am studying right now.	PRESENT PERFECT

I have already studied
lesson one.	PRESENT PERFECT CONT.

I have been studying for
two hours.	
PAST	PAST SIMPLE

I studied yesterday.	PAST CONTINUOUS

I was studying when they
arrived.	PAST PERFECT

I had already studied
lesson one, before I began
to study lesson two.	PAST PERFECT CONT.

I had been studying for
two hours before my
friends arrived.	
FUTURE	FUTURE SIMPLE

I will study tomorrow.	FUTURE CONTINUOUS

I will be studying when you arrive.	FUTURE PERFECT

I will already have studied lesson one, before I study lesson two.	FUTURE PERFECT CONT.

I will have been studying for two hours by the time you arrive.	
Annotations:
	= an action finished
	= an action is continuing (it has taken longer time)
	= results of an action persists (the action itself finished)