Tom started reading a book two hours ago.

He is still reading it and now he is on page 53.

(a)   53 pages so far. (read)

Rachel is from Australia. She is travelling round Europe.

She began her trip three months ago.

She (a)   for three months. (travel)

Rachel is from Australia. She is travelling round Europe.

She began her trip three months ago.

She (a)   six countries so far. (visit)

Patrick is a tennis player. He began playing tennis when he was 10 years old.

This year he won the national championship again – for the fourth time.

(a)   the national championship four times. (win)

Patrick is a tennis player. He began playing tennis when he was 10 years old.

This year he won the national championship again – for the fourth time.

(a)   since he was ten. (play)

When they left college, Lisa and Sue started making films together.

They still make films.

They (a)   films since they left college. (make)

When they left college, Lisa and Sue started making films together.

They still make films.

They (a)   five films since they left college. (make)

You meet somebody who is a writer. You ask:

(how many books / write?) (a)  

You meet somebody who is a writer. You ask:

(how long / write / books?) (a)  

A friend of yours is saving money to go on a world trip. You ask:

(how long / save?) (a)  

A friend of yours is saving money to go on a world trip. You ask:

(how much money / save?) (a)