類型：英語語法
時間：2023-05-04
點擊量1077
1、can能，可以，表說話人同意，許可還可表客觀條件許可，如:You can go now.
提建議或請求時可用can I, can you表客氣，如Can I buy you a
drink?
can和be able to表能力時的區(qū)別。
can表一般具有的能力，be able to表在特定條件下的能力，如:
Although the
driver was
badly hurt,he wasable to
explain what had
happened.
2、may
(1)可以，表說話人同意，許可或請求對方許可。You may go.
(2)(現(xiàn)在和將來)可能，也許，只用于肯定句和否定句中，如He may not be
right.
3、must,have to
must表主觀上的必須，have to表客觀上的必須，如:It's
getting late. I have to go. -Must I go now.-Yes,you must.(No, you needn't./ No, you don't have to.)
4、need,dare這二詞有實意動詞和情態(tài)動詞兩種詞性，如用作實意動詞后接動詞不定式to do，如用作情態(tài)動詞后接動詞原形。Need I go now? --Yes, you must./No, you needn't.)
5、
shall用于第一人稱疑問句中表說話人征求對方的意見或向?qū)Ψ秸埱螅纾?a href="/3-4337" title="aux.將要；應(yīng)該；一定；表示提供建議" target="_blank">Shall we
begin our
lesson?用于二、三人稱陳述句，表說話人命令、警告、允諾、威脅等口吻，如: You shall fail if you don't workharder.
6、
should表應(yīng)該，意為有責(zé)任，有義務(wù)。如:We should try our best to make our
country more
beautiful.
7、will表有做某事的意志、意愿、安心、打算，如"Will you lend me your book?" "Yes, I will."
8、should have done表應(yīng)該做而未做
must have done表對過去事實的肯定推測
could have done表本可以做某事
9、判斷句：肯定句用must, 否定句用can't,不太肯定用may,might
He must be in the
office now.
He must have gone to bed, for the
light is out.
He can't be in the office. He is at home.
He couldn't have
cleaned the
classroom,
because he didn't come here
today.
He
might be in the office, I am not sure.
He might have cleaned the room, I
suppose.
更多文章
