不定式的特殊句型so as to
1) 表示目的；它的否定式是so as not to do。
Tom kept quiet about the accident so as not to lose his job. 湯姆對事故保持沉默是為了不丟掉他的工作。
Go in quietly so as not to wake the baby. 輕點進去，別驚醒了嬰兒。
2) so kind as to ---勞駕
Would you be so kind as to tell me the time? 勞駕，現(xiàn)在幾點了。
不定式的特殊句型Why not
"Why not +動詞原形"表達向某人提出建議，翻譯為："為什么不……?" "干嗎不……?"
例如：Why not take a holiday? 干嗎不去度假？
不定式的時態(tài)和語態(tài)
1) 表示目的；它的否定式是so as not to do。
Tom kept quiet about the accident so as not to lose his job. 湯姆對事故保持沉默是為了不丟掉他的工作。
Go in quietly so as not to wake the baby. 輕點進去，別驚醒了嬰兒。
2) so kind as to ---勞駕
Would you be so kind as to tell me the time? 勞駕，現(xiàn)在幾點了。
不定式的特殊句型Why not
"Why not +動詞原形"表達向某人提出建議，翻譯為："為什么不……?" "干嗎不……?"
例如：Why not take a holiday? 干嗎不去度假？
不定式的時態(tài)和語態(tài)
| 時態(tài)語態(tài) | 主動 | 被動 |
| 一般式 | to do | to be done |
| 進行式 | to be doing | |
| 完成式 | to have done | to have been done |
| 完成進行式 | to have been doing |