| 词组 | necessary |
| 释义 | 1．下面每组里的第一句比第二句普通得多： 注意不可说 This work is necessary to finish within the week，也不可说 We are necessary to finish the work within this week。 2．necessary 后面接 for 或 to 没有区别，如下面各句都可以说： Food is necessary for（或to）life. Books are necessary for（或to）students. 但It is necessary for us to do this 等句子里的 for 不可改作 to。 3．It is（或 was）necessary that...里该用 should 或虚拟现在式。例如： It is necessary that he should come here every Sunday. It is necessary that he come（不用comes）here every Sunday. It was necessary that he should come here every Sunday. It was necessary that he come（不用came）here every Sunday. 4．说“必要的东西”用 necessary 或用 necessity 都可以，如 the necessaries of life 和 the necessities of life，Do you consider a motor-car a necessary? 和 Do you consider a motor-car a necessity?在用复数形式的场合，似乎在英国多用 necessaries，在美国多用 necessities。说“必要的事”通常用 necessity，不用 necessary，如 It has now become a necessity to read the whole document again 里不用 necessary。 |
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