英语中的 be busy doing sth 是一个常用搭配，比如：

He is busy writing. 

=He is busy (in) writing

他正忙于写作。

I’m busy cooking the dinner. 

=I am busy (in) cooking the dinner

我正忙着烧饭。

She was busy weeding the garden. 

She was busy (in) weeding the garden.

她在花园里忙着除草。

He’s busy studying for his finals. 

=He is busy (in) studying for rhis finals.

他正忙着准备期末考试。

请问专家：在这些句子中，到底是哪个修饰哪个啊？是 busy 修饰后面的现在分词？还是后面的现在分词修饰 busy？谢谢您！

解答如下：

以上都是后面省略介词in，做方面状语。be busy in doing sth=忙于做某事。in doing 修饰前面的谓语部分be busy。

动词前省略介词in 的16个常见结构归纳如下

1. be careful (in) doing sth做某事很小心

2. be busy  (in) doing sth 忙于做某事

3. be fortunate  (in) doing sth 很幸运做某事

4. be late  (in) doing sth 做某事做晚了或做迟了

5. have luck  (in) doing sth 做某事时很走运

6. have/find difficulty  (in) doing sth 做某事有困难

7. have trouble  (in) doing sth 做某事有困难

8. have bother  (in) doing sth做某事费劲

9. have a problem  (in) doing sth 做某事有困难

10. have a good/hard time (in)  doing sth 做某事很开心/辛苦

11. lose no time (in)  doing sth马上做某事

12. spend money/time  (in) doing sth 花费金钱/时间做某事

13. waste money/time  (in) doing sth浪费金钱/时间做某事

14. there is no difficulty (in)  doing sth 做某事没有困难

15. there is no use (in) doing sth 做某事没有用

16. there is no point (in) doing sth 做某事没有意义