making sure that the door is locked before you leave the room 为毛是making 而不是make

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makingsurethatthedoorislockedbeforeyouleavetheroom为毛是making而不是makemakingsurethatthedoorislockedbefor

making sure that the door is locked before you leave the room 为毛是making 而不是make
making sure that the door is locked before you leave the room 为毛是making 而不是make

making sure that the door is locked before you leave the room 为毛是making 而不是make
严格说来这不是一个独立句子.Make开头则是,是祈使句.making 开头这部分只能看作一个词组,可以做句子的伴随状语,不能独立成句.

句子开头的动词要变为动名词形式。一般句子开头的动词要么是doing要么是do.