5. happily → happy, 这里是宾语+宾语补足语。

4. I’ll be convenient next Sunday → Next Sunday will be convenient to me ,convenient是非人称形容词。

3. uncapable → unable/uncap able to tell或incapable of telling, capable的反义词是incapable, be unable to+动词原形， be incapable of + doing(没有能力做)。

2. respectable → respectful(恭敬的), respectable(可尊敬的)。

1. impossible → unable. Impossible是非人称形容词， 不可用来修饰人， 或可用It is impossible or him to find it out.

10. All the present students must cast their votes.

　　 注 释

9. Let asleep dogs lie.

8. This shirt is wool(l)en.

7. The number of girls is very few.

6. He looked differently after his return from Europe.