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介词in的省略

(1)在in this way, in that way, in the same way, in another way等表达中的介词in通常可以省略：

Do it (in) this way.这样做。

Let me put it (in) another way.让我用另一种方式解释。

(2)许多动名词前的介词in可以省略：

Be careful (in) crossing the street.过街道要小心。

He lost no time (in) answering the question.他马上就回答了那个问题。

但若介词in出现在句首，则通常不宜省略(www.yygrammar.com)：

In crossing the street he was run over.他在穿过马路时被汽车撞倒。

在这类用法中要特别注意一些常用句型：

be busy (in) doing sth忙于做某事

be late (in) doing sth做某事做晚了或做迟了

spend money [time] (in) doing sth花钱(时间)做某事

waste money [time] (in) doing sth浪费钱(时间)做某事

have luck (in) doing sth做某事时有运气(走运)

have difficulty (in) doing sth做某事有困难

have trouble (in) doing sth做某事有困难

have bother (in) doing sth做某事费劲

have a problem (in) doing sth做某事有困难

have a good time (in) doing sth做某事很开心

have a hard time (in) doing sth做某事很辛苦

find difficulty (in) doing sth做某事发现有困难

There is no difficulty (in) doing sth做某事没有困难

There is no use (in) doing sth做某事没有用

There is no point (in) doing sth做某事没有意义