一、分類：助動詞可分為三類
(一)、基本助動詞：這類助動詞幫助構(gòu)成謂語，表示語態(tài)﹑語氣﹑肯定﹑否定﹑疑問和強調(diào)。有三個：do, be, have
(二)、時態(tài)助動詞：幫助構(gòu)成謂語，表示時態(tài)。有二個：will, shall
(三)、情態(tài)助動詞：幫助構(gòu)成謂語，表示說話者的態(tài)度和看法。
有：can may shall will
could might should would
dare need must ought to
二、用法：
(一)、構(gòu)成疑問句
1.do: 放在主語之前(過去時用did, 單三人稱用does)
Do you send her the message?
A group of childre smile and say:“Stranger,where do you come from?”
Does a rat run across the street with everybody shouting“Kill it”?
Did you ask for the day off before you left school?
(一)、基本助動詞：這類助動詞幫助構(gòu)成謂語，表示語態(tài)﹑語氣﹑肯定﹑否定﹑疑問和強調(diào)。有三個：do, be, have
(二)、時態(tài)助動詞：幫助構(gòu)成謂語，表示時態(tài)。有二個：will, shall
(三)、情態(tài)助動詞：幫助構(gòu)成謂語，表示說話者的態(tài)度和看法。
有：can may shall will
could might should would
dare need must ought to
二、用法：
(一)、構(gòu)成疑問句
1.do: 放在主語之前(過去時用did, 單三人稱用does)
Do you send her the message?
A group of childre smile and say:“Stranger,where do you come from?”
Does a rat run across the street with everybody shouting“Kill it”?
Did you ask for the day off before you left school?