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1、中文：为了准时，我们加快了步伐。
(误)So as to be in time we hurried.
(正)In order to be in time we hurried.(so as to只可放在句中，in order to可放在句首或句中。)
2、中文：你说这些话真傻。
(误)It"s very foolish for you to say so.
(正)It"s very foolish of you to say so.(表示评价的形容词被带逻辑主语的不定式修饰时，介词要用of.)
3、中文：你没有告诉他们永远不要做那件事吗?[环球网校成人高考频道整理不定式误用]
(误)Didn"t you ask them to never do that?
(正)Didn"t you ask them never to do that?(never要放在to之前。)
4、中文：你没有告诉他们永远不要做那件事吗?
(误)Here is a new book for you to read it.
(正)Here is a new book for you to read.(作形容词用法的带逻辑主语的不定式for you to read的宾语，实际上就是它所修饰的new book，其后不可再加宾语。)