Ответ:

It was a long journey.

1. Was it a long journey?

2. Was it a long or short journey?

3. Why was it a long journey?

4. It was a long journey, wasn’t it?

5. What was a long journey?

He didn’t go into Coliseum.

1. Didn’t he go into Coliseum?

2. Didn’t he go into Coliseum or to Campo de' Fiori?

3. Where didn’t he go to?

4. He didn’t go into Coliseum, did he?

5.  Who didn’t go into Coliseum?

He bought some postcards in the shop.

1. Did he buy some postcards in the shop?

2. Did he buy some postcards or some magnets in the shop?

3. Where did he buy some postcards?

4.  He bought some postcards in the shop, didn’t he?

5. Who bought some postcards in the shop?

I’ll tell you about my holidays.  

1. Will I tell about my holidays?

2. Will I tell about my holidays or my weekend?

3. What will I tell about?

4.  I’ll tell you about my holidays, won’t I?

5.  Who will tell about my holidays?