| 词组 | when |
| 释义 | 1．在定义的开首不该用 when，如不该说 Homesickness is when one longs for one's home。 2．疑问副词 when 所修饰的动词不该属于现在完成时态，如不可说： When has he done it? I wonder when he has done it. 该改作： When did he do it? I wonder when he did it. 但 When has he done it?用作修辞疑问句便不错，作“他何曾做过这个？”解。 3．疑问副词 when 所修饰的动词可以属于将来时态。例如：When will he go? 和 I wonder when he will go. 但关系副词 when 所修饰的动词往往不可属于将来时态，如不可说 When he will go, I shall go with him。该把 will go 改作 goes。比较下面三句： When he goes（不可用will go）, I shall go with him. I am looking forward to the day when I shall be able to go with him. A meeting will take place tomorrow, when I shall express my views on the subject. 第一句里的 when 引导一个状语从句，第二句里的 when 引导一个形容词从句，第三句里的 when 作 and then 解。 4．下面每组里的两句都可以说，似乎第二句比第一句普通： |
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