高中英语语法I began to study English three years ago.How long did you study English last year?两句话中为什么动词都是用原形study而不是studied?

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高中英语语法I began to study English three years ago.How long did you study English last year?两句话中为什么动词都是用原形study而不是studied?
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高中英语语法I began to study English three years ago.How long did you study English last year?两句话中为什么动词都是用原形study而不是studied?
高中英语语法
I began to study English three years ago.
How long did you study English last year?
两句话中为什么动词都是用原形study而不是studied?

高中英语语法I began to study English three years ago.How long did you study English last year?两句话中为什么动词都是用原形study而不是studied?
1.begin to do或begin doing开始做某事 2.did后跟动词原形

1,begin to do 是一种固定搭配,叫动词不定式,其他类似用法的词还有afford (付得起),agree(同意),aim(力求做到),appear(显得),arrange(安排),ask(要求),attempt (试图),care(想要),choose(决定),claim(声称),condescend(屈尊),consent(准许),decide(决定),demand(要求),deter...

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1,begin to do 是一种固定搭配,叫动词不定式,其他类似用法的词还有afford (付得起),agree(同意),aim(力求做到),appear(显得),arrange(安排),ask(要求),attempt (试图),care(想要),choose(决定),claim(声称),condescend(屈尊),consent(准许),decide(决定),demand(要求),determine(决心),endeavor(竭力),expect(期待),fail(未履行),help(帮助),hesitate(犹豫),hope(希望),learn(学会),manage(设法),neglect(疏忽),offer(主动提出),plan(计划),prepare(准备),pretend(假装),proceed(接着做),promise(答应),prove(证明),refuse(拒绝),resolve(解决),seem(觉得好像),swear(发誓),tend(往往会),threaten(预示),undertake(承诺),volunteer(自愿做),vow(发誓),want(想要),wish(希望)
2,对过去式进行提问加助动词did时,动词用原形

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你好,很高兴回答你的问题。
第一句中,begin to do sth.意为开始做某事,这里的to do为不定式,也就是说这里的to后一定要加动词原形。
第二句为特殊疑问句,did为本句的助动词,已经把时态表现出来了,study 就不用再变时态了。
望能采纳!