hard

1.hard通常作“困难的”解。例如：This is a hard question (to answer). The question is hard to answer. 和It is hard to answer this question. 在hard of hearing（有些聋的）中作“艰难的”解，除了这一表达方式以外，这意思现在极不普通，该避免。如不该说I am hard to learn English，该改作I find English hard to learn或I find it hard to learn English。

2.注意This question is hard to answer和I find English hard to learn里用to answer和to learn，改用to be answered和to be learnt不是绝对不可能，但很少见，不算正当。

3.hard后面有时接of和表示动作的名词。例如：This food is hard of digestion.

4.hard通常不和impossible连用，如通常不说It is hard, if not impossible和I find it very hard, though not impossible。该把hard改作difficult。

5.a hard time指个人的“困难时期”，hard times指“不景气”。