什么时候用助动词,什么时候用be动词例
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当句子是主系表的时候就是含有 be 动词,然后 be 动词提前。表语是表达主语特征的,be 动词也叫系动词。
例如:She is beautiful. 就把 be 动词提前
助动词是针对句子中没有 be 动词和情态动词的时候,变成一般疑问句,加的帮助完成句子 疑问的词,
例如:I like flowers. Do you like flowers ?
如果主语是单数第三人称 用助动词 does 句子本身有 be 动词的,如 He is a student.---Is he a student? (有情态动词的一样,如 He can swim.---Can he swim?)
句子中无 be 动词或 can 等情态动词的,如
He works hard.---Does he work hard?
They work hard.----Do they work hard?
be 当“成为”讲的时候 如:I want to be a teacher in the future.
问句:What do you want to be in the future?
例如:She is beautiful. 就把 be 动词提前
助动词是针对句子中没有 be 动词和情态动词的时候,变成一般疑问句,加的帮助完成句子 疑问的词,
例如:I like flowers. Do you like flowers ?
如果主语是单数第三人称 用助动词 does 句子本身有 be 动词的,如 He is a student.---Is he a student? (有情态动词的一样,如 He can swim.---Can he swim?)
句子中无 be 动词或 can 等情态动词的,如
He works hard.---Does he work hard?
They work hard.----Do they work hard?
be 当“成为”讲的时候 如:I want to be a teacher in the future.
问句:What do you want to be in the future?
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