Ответ: 1.
Why are you (walking) so fast today? You usually (walk) quite slowly.
2.
What are you (buying) here? – I (am buying) an English textbook at present.
3.
He (broke) his leg in a skiing accident last year.
4.
We are in September now, and we (have done) a lot of work this year; we (did) a
lot last year also.
5.
Where are you going this Sunday? – This Sunday I (am going) to the country, but
usually on Sundays I (stay) at home.
6.
It’s 3 p.m. and he (hasn’t eaten) anything today, but he (ate) a good dinner
last night.
7.
The actors (arrived) yesterday and (have started) rehearsals early this
morning.
8.
I can’t answer the phone now because I (am papering) the sitting-room walls.
9.
I usually (go) to bed before midnight. Today I (have gone) a little later.
10.
Do you always (write) with your left hand?