助动词后面的动词第三人称要加s吗
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助动词后面的动词第三人称不加-s。
助动词有两种,一种叫做时态助动词,一种叫做情态助动词。
一、时态助动词。
时态助动词有四种:be、have、do、will。
be动词用于构成进行时,它后面的动词要用现在分词形式;它也可以用于构成被动语态,后面的动词用过去分词形式,如:
I'm learning German at home now.
He is playing the piano in his room.
The song is sung by Jolin.
I like the building which was designed by Mr. Robertson.
助动词have用于构成完成时(包括完成进行时),它后面的动词要用过去分词形式,如:
I have learned English for one score years.
I have been learning English for one score years.
How long has he played the piano?
助动词do是为无助动词的动词提供助动词,是构成一般时的,它可以构成一般现在时和一般过去时的否定句、疑问句和部分倒装句,后面的动词用原形,如:
I don't speak English.
Did he make many mistakes on the test?
助动词will是构成一般将来时和过去将来时的,后面的动词也要用原形,如:
Will it rain tomorrow?
I won't go on Friday. I'll go on Sunday.
二、情态动词。
情态动词本身有一定的字义,如can、may、must、shall、will、ought to、be to、have to、be going to、used to、need、dare等,不能独立充当谓语,必须后跟另一个动词构成谓语动词。情态动词后面的动词要用原形,第三人称单数时不加-s,如:
He can speak English.
Can he speak English?
He can't speak English.
A unit can measure how hot the pepper is.
助动词有两种,一种叫做时态助动词,一种叫做情态助动词。
一、时态助动词。
时态助动词有四种:be、have、do、will。
be动词用于构成进行时,它后面的动词要用现在分词形式;它也可以用于构成被动语态,后面的动词用过去分词形式,如:
I'm learning German at home now.
He is playing the piano in his room.
The song is sung by Jolin.
I like the building which was designed by Mr. Robertson.
助动词have用于构成完成时(包括完成进行时),它后面的动词要用过去分词形式,如:
I have learned English for one score years.
I have been learning English for one score years.
How long has he played the piano?
助动词do是为无助动词的动词提供助动词,是构成一般时的,它可以构成一般现在时和一般过去时的否定句、疑问句和部分倒装句,后面的动词用原形,如:
I don't speak English.
Did he make many mistakes on the test?
助动词will是构成一般将来时和过去将来时的,后面的动词也要用原形,如:
Will it rain tomorrow?
I won't go on Friday. I'll go on Sunday.
二、情态动词。
情态动词本身有一定的字义,如can、may、must、shall、will、ought to、be to、have to、be going to、used to、need、dare等,不能独立充当谓语,必须后跟另一个动词构成谓语动词。情态动词后面的动词要用原形,第三人称单数时不加-s,如:
He can speak English.
Can he speak English?
He can't speak English.
A unit can measure how hot the pepper is.
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不用,助动词已经按照人称变化好了,后面的动词用原形就好。例如 He doesn't like playing basketball. he是第三人称,所以助动词do要改为 does,后面动词就用play 原形。
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不要
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第三人称单数体现在助动词身上。
如:Does he stay here?
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