七年级上重点知识unit4-5讲和练.doc

七年级上重点知识unit4-5讲和练一名词变复数：可数名词有单数和复数两种形式单数可数名词变复数：规则变化：1一般情况是在名词后面加上“s”，如bookbooks， rulerrulers等； 2以s， sh， ch， x等结尾的词加“es”，如busbuses， watchwatches 3以辅音字母y结尾的词，变y为i加es，如babybabies等；以元音字母 y结尾的名词变复数时，直接加s变复数，如， boys， days 4以o 结尾的名词变复数时： 一般情况下加s如：photophotos zoozoos 但两菜加es的名词有： potatopotatoes tomatotomatoes 5以f或fe结尾的名词变f， fe 为ves，如 knifeknives， wifewives， lifelives， 练习：一.写出下列各词的复数形式1.desk 2.key 3.orange_ 4.boy 5.friend 6.photo_7.parent 8.son 9cousin 10.knife_11.case 12. box 13.card 14.family 15.it/he/she_二把下列句子变为复数句。1. This is my dictionary. _2.That is an eraser. _3.It is a red orange. _4.She is my wife_5.He is a Chinese boy. _三用括号内所给的词的适当形式填空。1.Look! Your _(tape) are on the bed .2.There are three_( watch) in the drawer.3.Please take these_(thing) to your cousin.4.Here _(be) Tommys black and white TV.5.Two black _(hat) are on the floor.6.Alice and Gina are his _(姐妹)7.These are my _（朋友）8.My _(父母)are Peter and Nancy.9.Those _(family) are very happy (幸福的)。10.Here are some _(photo) of my family.四句型转化专练I am Mike.(一般疑问句)_？1. This is his family photo. (一般疑问句) _？2. These are her parents .(变否定句) _3. I know your name .(变否定句) _4. Its in the backpack.（变复数句）_5. Here is my family photo（变复数句）_6. Her name is Gina（对划线提问）_？7. Two and five is seven（对划线提问）_？8. My pencil case is red。（对划线提问）_？9. Her keys are on the dresser（对划线提问）_？Have 实义动词表示”有”，例：I have a book. （1） 变一般疑问句在句首加助动词Do，其它不变抄下来，句号变问号。第一人称I变成第二人称you。肯定回答是Yes，主语（主格代词）+do；否定回答是No，主语（主格代词）+dont如：I have a brother -Do you have a brother? Yes， I do ; No, I dont .(2)变否定句时在have 前加dont 其它不变抄下来。I have a brother - I dont have a brother .has 是have 的单数第三人称形式如果主语是单数第三人称he ，she，it时表示“有”要用”has”如：He has a brother 。 Jim has a soccer ball(1)变一般疑问句时在句首加助动词Does，has再变成原形have，其它不变抄下来。肯定回答是Yes，he/she/it +does; 否定回答是No，he/she/it+doesnt .(2)变否定句时在has前加doesnt ,has 变成原形have其它不变抄下来。Jim has a soccer ball-Does Jim have a soccer ball? Yes, he does; No, he doesnt Jim doesnt have a soccer ball练习题：1.They have a computer.否定句：_一般疑问句：_?肯定回答：_否定回答：_2.He has a TV. 否定句：_一般疑问句：_?肯定回答：_否定回答：_3.Ann has a pingpong-ball否定句：_一般疑问句：_?肯定回答：_否定回答：_4. My parents have a computer . 否定句：_一般疑问句：_?肯定回答：