understand

1.Do you understand French? 和Can you understand French? 都可以说，用Do比用Can普通。

2.可以说I find it difficult to make myself understood和Have I made myself understood clearly? 但不可说I find it difficult to make you understood，该改作I find it difficult to help you (to) make yourself understood。

3.比较下面两句：

• I understand（据我所知、如是我闻）that he is quite strong again.
• I know（［确实］知道）that he is quite strong again.

但I understand why he has got quite strong again so quickly里的understand作“（完全）明白”解。