6. 这个数学题目太难了，以致于任何人都做不岀。

The maths problem is too difficult .

The maths problem is so difficult  .

5. 如果琳达不邀请我的话，我是不会去她的生日聚会的。

I won’t go to Linda's birthday party if .

I won’t go to Linda's birthday party unless  .

4. 昨晚他直到完成了工作才离开办公室。

He after he finished his work last night.

He until he finished his work last night.

3. 赶快，否则你要错过早班车了。

，Or you won’t catch the early bus.

If you ，you will miss the early bus.

2. 努力学习，你就能赶上你的同学。

and you will catch up with your classmates.

If , you will catch up with your classmates.

三、完成句子

1. 在他待在上海期间，他参观了科学博物馆。

When , he visited the science museum.

During ，he visited the science museum.

12. I found a wallet lying at the corner when I (sweep) the floor yesterday.

11. You can go to your teachers for help when   (have) problems with your studies.

10. You had better not listen to music while you (do) your homework.

9. How many books they (read) since the end of last spring?