GRAMMAR

Present Continuous	Past Continuous	Future Continuous
I am studying English now.	I was studying English when you called yesterday.	I will be studying English when you arrive tonight. I am going to be studying English when you arrive tonight.
Present Perfect	Past Perfect	Future Perfect
I have studied English in several different countries.	I had studied a little English before I moved to the U.S.	I will have studied every tense by the time I finish this course. I am going to have studied every tense by the time I finish this course.
Present Perfect Continuous	Past Perfect Continuous	Future Perfect Continuous
I have been studying English for five years.	I had been studying English for five years before I moved to the U.S.	I will have been studying English for over two hours by the time you arrive. I am going to have been studying English for over two hours by the time you arrive.