| 词组 | if |
| 释义 | ，whether 1． 在 reporting question 中表示 “是否”时，if 和 whether 可以换用: I asked her if / whether she was coming to the evening party. 2． 在动词不定式前用 whether，不用 if: He is deciding whether to accept the job offer. 3． 在介词后只能用 whether: There is some doubt as to wheth- er he will resign from his post. It all depends on whether it snows or not. 4． 在名词后一般只用 whether: It's her choice whether she likes to continue or quit. 5． 与 or not 连用时，尤其当 or not 直接跟在后面时，用 whether: We don't know whether or not the dean's planning to make a speech. Whether or not it rains，we'll drive to Boston. 6． 与 or 连用，尤其当与 or 分开出现时，if 或 whether 都可以用，但一般常用 whether: I don't know whether / if my brother is dead or alive. |
| 随便看 |
英语用法大全包含3679条英语用法指南，基本涵盖了全部常用英文词汇及语法点的翻译及用法，是英语学习的有利工具。