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，在初級英語里可見四種用法：
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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