1) I feel sick. I ate too much.
2) That man on the motorbike isn’t wearing a helmet. That’s dangerous.

3) When we got to the restaurant, there were no free tables. We hadn’t reserved one.

4) The notice says that the shop is open every day from 8.30. It is 9 o’clock now but the shop isn’t open yet.
5) The speed limit is 30 miles an hour, but Catherine is doing 50.

6) I went to Paris. A friend of mine lives in Paris but I didn’t go to see him while I was there. When I saw him later, he said,
7) I was driving behind another car. Suddenly, the driver in front stopped without warning and I drove into the back of his car. It wasn’t my fault.
8) I walked into a wall. I wasn’t looking where I was going.

Объяснение:

1 That man on the motorbike wasn't wearing a helmet. That was dangerous. He should have worn a helmet.

2 When we got to the restaurant, there were no free tables. We hadn't reserved one. We should have reserved a table.

3 The speed limit is 30 miles an hour, but Kate was doing 50. She shouldn't have driven so fast.

4 Laura gave me her address, but I didn't write it down. Now I can't remember it. I should have written Laura's address down.

5 I was driving behind another car. Suddenly, the driver in front stopped without warning and I  drove into the back of his car. It wasn’t my fault. The driver shouldn't have stopped without warning.

6 I walked into a wall. I was looking behind me. I wasn't looking where I was going. I should have looked where I was going.