1. I went to bed last night only when he came back from work. (only倒装)

→____________________________________________________

2. Wild elephants appear from time to time to destroy the crops.

→Wild elephants appear ____ _____ ____ to destroy the crops.

3. When we are asked about our future plan, we don't know what to say.

→____ ____ _____ our future plan, we don't know what to say.

4. He set out to break the record for the English Channel swim. (用set短语替换)

→_________________________________________________________________

5. Even their teacher can't tell Tom from his twin brother.

→Even their teacher can't_______ ______Tom ________his twin brother.

答案：1. Only when he came back from work did I go to bed last night.

2. now and then

3. When asked about

4. He set about breaking the record for the English Channel swim.

5. distinguish between; and