不定式

1.(not)in order (not)so as (not) +to do...不定式作目的状语

【用法】to do, in order to do作目的状语可以位于句首，但so as to do不可以。

【例句】In order not to be late, she cut across the fields.为了不迟到，她抄近路穿过了田野。

2.so+形容词/副词+as

too+形容词/副词

形容词/副词+enough+to do... 不定式作结果状语

【例句】How could you be so stupid as to believe him?你怎么这么笨，竟然相信他的话?

如果定语从句的时态与主句的时态具有同时性(包括谓语有情态动词)或之后性，则可以用“关系代词或关系副词+不定式”来简化，或直接用“不定式”来修饰先行词。要注意的是，此时的不定式一定要是及物动词，如果是不及物，则需要在动词后面加上相应的介词，使之成为及物动词短语。这个结尾的介词可以提前到关系代词前面，也可以继续留在句尾。前者是正式说法，后者是非正式说法。

例1：We moved to the country so that the children would have a garden in which they could play in.

我们搬到了乡下，好让孩子们有个花园在里面玩。

改为：We moved to the country so that the children would have a garden in which to play.

或者：We moved to the country so that the children would have a garden to play in.

例2：He felt miserable unless he had neighbors (whom)he could quarrel with.

他要是没有可以吵架的邻居就难受。

改为：He felt miserable unless he had neighbors with whom to quarrel.

或者：He felt miserable unless he had neighbors to quarrel with.

例3： The conference which will be held this afternoon is bound to be a great success. 计划在今天下午举行的会议一定会取得成功。

改为：The conference which to be held this afternoon is bound to be a great success.

或者：The conference to be held this afternoon is bound to be a great success.

例4：At a ceremony in Honolulu on Dec. 29, Postmaster General John E. Potter gave a preview of the Lunar New Year Commemorative Stamps Souvenir Sheet, the grand finale of the Lunar Year stamp series, which will be available in 2005.

12月29日，美国邮政总局局长约翰·E·波特在檀香山从句了农历新年的纪念邮票小型张的揭幕仪式，这枚小型张将于2005年正式发行，它为农历新年的系列纪念邮票写下了完美的结局。(注意：与定语从句一样，也可以采用非限制性形式)

改为：At a ceremony in Honolulu on Dec. 29, Postmaster General John E. Potter gave a preview of the Lunar New Year Commemorative Stamps Souvenir Sheet, the grand finale of the Lunar Year stamp series, to be available in 2005.