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小升初英語語法:Be的四個(gè)功能歸納

時(shí)間:2024-09-09 15:08:18 基礎(chǔ)英語 我要投稿
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小升初英語語法:Be的四個(gè)功能歸納

  be是一個(gè)多功能動(dòng)詞,在初級(jí)英語里可見四種用法:

小升初英語語法:Be的四個(gè)功能歸納

  功能一,系動(dòng)詞be

  be為連系動(dòng)詞,中心詞義是是,句型為主+系+表結(jié)構(gòu)。be的形式常用am, is, are(現(xiàn)在式);was, were(過去式);will/can/may/must be(助動(dòng)詞/情態(tài)動(dòng)詞+原形);have/has/had been(助動(dòng)詞+過去分詞)等。如:

  To help animals is helping people.(一般現(xiàn)在時(shí))

  The twins were very busy yesterday.(一般過去時(shí))

  It will be sunny tomorrow.(一般將來時(shí))

  She has been ill for over a week.(現(xiàn)在完成時(shí))

  功能二,助動(dòng)詞be

  助動(dòng)詞be,無詞義,輔助主要?jiǎng)釉~一起在句中作謂語動(dòng)詞。用法如下:

  1. be+doing:構(gòu)成進(jìn)行時(shí)態(tài),有現(xiàn)在和過去兩種進(jìn)行時(shí)態(tài)。如:

  The girls is reading and copying the new words now.

  Young Tom was always asking questions and trying out new ideas.

  2. be+done:構(gòu)成被動(dòng)語態(tài)(主語是動(dòng)作的承受者,done必須是及物動(dòng)詞)。如:

  Tea is grown in my hometown.(一般現(xiàn)在時(shí)的被動(dòng)語態(tài))

  This building was built three years ago.(一般過去時(shí)的被動(dòng)語態(tài))

  Our classroom has been cleaned and tidied already.(現(xiàn)在完成時(shí)的被動(dòng)語態(tài))

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