小學30個語法點 Unit 16 助動詞
- Unit 16 助動詞
- 語法講解
- 巧學妙記
- 語法練習
- 答案
助動詞和實義動詞一起構(gòu)成謂語，幫助實義動詞構(gòu)成各種時態(tài)、語態(tài)及構(gòu)成否定或疑問等結(jié)構(gòu)。常用的助動詞有be，do，does，did，have，has，had，will，shall，would，should等。
助動詞be
助動詞be主要有am，is，are，was，were五種形式，與現(xiàn)在分詞構(gòu)成進行時態(tài)。
I am reading a story book. 我正在看故事書。
Sarah is drawing a picture. 莎拉正在畫畫。
Tom was looking out of the window. 湯姆那時在往窗外看。
助動詞do
助動詞do主要有do，does，did三種形式。
與動詞原形連用構(gòu)成疑問句或否定句，還可以構(gòu)成簡略回答。
What do you like ? 你喜歡什么？
Does she like music? 她喜歡音樂嗎？
Yes，she does . 是的，她喜歡。
助動詞have
助動詞have主要有have，has兩種形式，與過去分詞構(gòu)成現(xiàn)在完成時。
Have you been to Disneyland? 你去過迪士尼樂園嗎？
Jim has been to China twice. 吉姆去過中國兩次。
I haven't done my homework. 我還沒做完作業(yè)。
助動詞will/would, shall/should
助動詞will，shall用于構(gòu)成一般將來時，would，should用于構(gòu)成過去將來時；shall，should主要用第一人稱，will，would可用于一切人稱。
We will meet at the bus station. 我們將在車站見。
Perhaps I shall pay a visit to England this summer. 或許今年夏天我將去英格蘭旅行。
特別提示
1．will，would，shall，should除了表示將來時間以外，更多的是作情態(tài)動詞。
2．shall，should用于第一人稱表示將來時，在口語中常被will，would替代。
一、用正確的be動詞填空。
1．—What's the weather like?
—It _______(is, are) cloudy.
2．—Look at the boys. __________(Are, Is) they your brothers?
—Yes, they are.
3．—The crayons __________(are, aren't) on the table.
They are under the table.
4．—__________(Is, Are) it a cat?
—No, it isn't.
5．—__________(Are, Is) your mother a doctor?
—Yes, she is.
二、從括號里選擇正確的動詞形式填空。
1．He __________ have classes in the morning.( don't/doesn't)
2．Lily and Lucy __________ good friends.(is/are)
3．__________ you finished your paper?(Has/Have)
4．He __________ have classes in the morning.( don't/doesn't)
5．__________ she watch TV every day?(Does/Do)
三、按要求完成下列句子。
1．We went to the U.S. last month.（變成一般疑問句）
2．Does he like apple juice?（作肯定回答）
3．She made a poster last night.（變成否定句）
4．Do you have a dog?（作否定回答）
5．They bought some key rings for us in Mexico.（對畫線部分提問）
一、1．is
2．Are
3．a(chǎn)ren't
4．Is
5．Is
二、1．doesn't
2．a(chǎn)re
3．Have
4．doesn't
5．Does
三、1．Did you go to the U.S. last month?
2．Yes, he does.
3．She didn't make a poster last night.
4．No, I don't.
5．What did they buy for us in Mexico?
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