1. I happened to be (looking) out of the window when I saw his car (approaching) the gate.
2. It has (been) ages since I last (saw) Nick. He is said (to have been married) Darcy and they are believed (to have left) the country.
3. We are going by sea but I'd rather we (went) by air. I (have never/been) a good sailor.
4. Listen to the birds (singing). You know, I recently bought a parrot, but now I am (thinking) of buying a canary bird. I want it to (sing) for me in the morning.
5. Look at her! She (has had her hair/cut). She looks gorgeous!
6. We’d better (hurry up)… I’d hate to (arrive) late. / I’d rather we (would not arrive) late.
2)In autumn nights are long and dark. In summer they weren't long and dark.
3)In autumn the sky is often grey. In summer it wasn't grey.
4)In autumn the wind is cold and strong. In summer it wasn't cold and strong.
5)In autumn trees are red and yellow. In summer they weren't red and yellow.
6)In autumn schoolchildren are at school. In summer they weren't at school.
7)In autumn Sally doesn't roller-skate. In summer she roller-skated.
8)In autumn Mr Barker doesn't play tennis in the park. In summer he played tennis in the park.
9)In autumn John doesn't vizit his cousins in Scotland. In summer he vizited his cousins in Scotland.
10)In autumn the Barkers don't enjoy their picnics. In summer they enjoyed theri picnics.
11)In autumn Margaret Barker doesn't cook picnic food. In summer she cooked picnic food.
12)In autumn Chase doesn't walk in the park a lot. In summer Chase walked in the park a lot.