Verb tenses guide

SIMPLE
Present
Past
Future
CONTINUOUS
PERFECT
PERFECT CONTINUOUS
They write.
He writes.
They are writing.
He is writing.
They have written.
He has written.
They have been writing.
He has been writing.
They wrote.
He wrote.
They were writing.
He was writing.
They had written.
They had been writing.
They will write.
He will write.
They will be writing.
He will be writing.
They will have written.
They will have been writing.

SIMPLE
Present
Past
Future
CONTINUOUS
PERFECT
PERFECT CONTINUOUS
V-s
be + V -ing
have V3
have been
V-ing
V2
was + V -ing
had V3
had been
V-ing
will V
will be + V -ing
will have V3
will have
been V-ing