present simple
future continuous
past perfect simple
future will
present perfect continuous
present continuous
past simple
past continuous
be going to
present perfect simple
future perfect simple
She is writing a book.
She writes a book.
She will be writing a book.
She will have written a book.
She had written a book.
She has been writing a book.
She is going to write a book.
She wrote a book.
She will write a book.
She was writing a book.
She has written a book.