2021-2022学年 Unit4 Don't eat in class. 语法讲解（word版）

Unit4 Don't eat in class.
语法+重点句型
（一）祈使句
1.概念：一般以_______开头，表示____/_____/______/______等。
2.句子结构
①V.型=________ + 其他(，please)
肯定句：Talk in class. / Spell it,please. / Please stand up.
否定句：Don't + V.型 Don't talk in class.
②B.型=________ + 其他
肯：__________保持安静 __________上课迟到
否：________ + B.型 不要迟到_____________
③L型=_____________
肯：__________让我帮助你 __________让她走
否：Don't + L型 / Let sb._____do sth. 别让她走__________
④N型=_____+ ____/_____
No mobile! No smoking! No Parking!
练习：将下面的句子改为祈使句，每空一词。
1. You can come in.
______ ____, please.
2. I can help you.
_____ me ______ you.
3. You can’t eat in class.
_______ _____ in class.
4. You can’t be late for school.
______ ____ late for school.
5. You can’t take photos here.
_____ photos here.
6.“Please be quiet. No_____(talk)!” says our biology teacher.
（二）have to
1.强调客观要求，被迫性（外界）“________”
形式： ①三单______ 过去式_______
②否定：______/______have to=_________ 没必要；不必
③一般疑问句：____/_____+其他
I have to______(get up)at 5:00 am everyday.
Nick______(have to)wear a uniform.
have to和must
must（情态动词，无变化）强调主观上的愿望，“_______”
否定：________一定不能
练习：
1.I_____ get off the bus at the next stop.
2.We_______go swimming in the lake.
3.It’s cold outside. We _______ stay at home.
4.We ______ be good with our parents.
5.—_____I finish my work now —No, you______.You can do it later(稍后).
6.You must______(be) more careful next time.
7.The children ________play football on the road.
A.can B.must C.mustn’t D.may
8.—Must I clean the blackboard —No,you ________.
A.needn’t B.mustn’t C.can’t D.may not
9.Your mother ________there,she has gone to America.
A.must be B.could be C.may be D.can’t be
句型转换
1. —Can the students eat in the classroom (作否定回答)
—No, ___________.
2. Bill has to play sports every morning. (改为一般疑问句)
_____ Bill _____ ___ play sports every morning
3. You can’t wear a hat in class. (改为祈使句)
______ ____ a hat in class.
4. He has to see his grandparents on weekends. (对划线部分提问)
What _____ he ____ ____ ____ on weekends
5. Come in, please. (改为否定句)
_____ _____ in, please.