since, for, yet...
I had been going.., She had been talking..,
I have been writing. She has been writing.
Present Continuous (Progressive)
Past Continuous (Progressive)
for a year before.., for a while and then..
Present Simple
Past Simple
Past Perfect Continuous
I wrote. She played.
I write. She writes.
yesterday, a few days ago, in 1967...
every day; usually; never..
Present Perfect Continuous
Past Perfect Simple
before we went, prior to buying,..
Present Perfect Simple
right now; at the moment; while...
while i was.., seven o'clock yesterday,...
I am writing. She is writing.
for a while, for hours, since..
I have written. She has written.
I was writing. She was playing.
I had talked, She had broken,...