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He took the book out of his bag and began to read.read 在这句里是

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He took the book out of his bag and began to read.read 在这句里是原型,还是过去式,或过去分词?
egin to do sth 原型呀 固定语法
再问: do 就是句中的read ?? sth是??? 这种固定是每个对应还是???
再答: 很多词都有 +to do sth 的结构,是固定的,在多读多看中熟悉, 有的是+ do sth 比如 had better do sth 有的是+ doing sth 比如 insist in doing sth do 就是 read,后面的sth 就是the book ,只不过他没有写 He took the book out of his bag and began to read the book. 加上就重复了,所以不加