含行为动词的一般现在时
．
只有主语在第三人称单数时,用动词的“三单形式”，其他人称用动词原形表示。
例如：I come from China.
We come from China.
They come from America.
She/He/Tom comes from England.
★动词三单形式的变化规则：
1.（1）多数直接在动词词尾加_____________
play — plays like — likes
ask--- work--- get--- call---
（2）以字母s, x, ch, sh或o结尾的动词，在词尾直接加_______
watch- wish--- do--- go---
（3）以“辅音字母加 - y”结尾的动词，要先变____________
try--- study--- cry--- fly---
2.不规则变化：be---- have---
三、一般现在时的句子转换：
（1，变一般疑问句时，在主语前加助动词_______ (I, we, you,以及复数),______-（第三人称单数she,he,it等）变成问句；
（4）变否定句时，在主语后谓语动词前加助动词______________变成否定句，切记：助动词后的动词则还原成动词原形。
例：①陈述句：We get up（起床） at 7:00 every morning.
疑问句→Do you get up at 7:00 every morning?
否定句→We don’t get up at 7:00 every morning.
②陈述句：She has a brother.
疑问句→ Does she have a brother?
否定句→ She doesn’t have a brother.
※在一般现在时中，当主语是第三人称单数时，谓语动词要用第三人称单数形式，即常在动词原形后加-s或-es。
但有些同学们对于哪些主语是第三人称单数还不十分清楚，
现归纳总结如下：
一、人称代词he, she, it是第三人称单数。如：
He likes watching TV. 他喜欢看电视。
She has lunch at twelve. 她十二点吃午餐。
二、单个人名、地名或称呼作主语；是第三人称单数。如：
①Han Mei likes salsd . 韩梅喜欢萨拉。
②Beijing is in China. 北京在中国。
③Uncle Wang often plays volleyball.. 王叔叔经常打排球。
三、单数可数名词或"this / that / the+单数可数名词"作主语时，是第三人称单数。如：
②This book is yours. 这本书是你的。
③That car is red. ④The cat is Lucy's. 这只猫是露茜的。
四、不定代词someone, somebody, nobody, everything, something等及指示代词this, that
作主语时，是第三人称单数。
①Everyone is here. 大家到齐了。
②There is a watch on the table. 桌上有块手表。
③This is a pen. 这是一支钢笔。④That is an eraser.
五、不可数名词作主语时为第三人称单数。如：
①The milk（牛奶） is in the glass. 牛奶在玻璃杯里。
②The bread is very small. 那面包很小。
六、当数字或字母作主语时，看作第三人称单数。如：
①"6" is a lucky number. "6"是个吉利数字。
②"I" is a letter. "
.
一般现在时用法专练:
一、写出下列动词的第三人称单数形式。
have like drink _____ go _____
stay ____ study___ _ teach_____ play______
make ______ look _____ _have____ come_____
watch______ plant_____ fly ____ _ do_____
二、用括号内动词的适当形式填空。
1. He often ________(have) dinner at home.
2. Daniel and Tommy _______(be) in Class One.
3. We_______(not watch) TV on Monday.
4. Nick ____ ___(not go) to the zoo on Sunday.
5. ______ they ________(like) pears?
6. _______ your parents _______(have) eggs every day?
7. There ________(be) some water in the bottle.
18. Mike _______(like) cooking.
9. They _______(have) the same hobby.
10. Liu Tao ______ _(do) not like PE.
11. This boy often _______(watch) TV in the evening.
三、按照要求改写句子
1. Daniel watches TV every evening.(改为否定句)____________________________________
2. I do my homework every day.(改为否定句)____________________________________
3. She likes milk.(改为一般疑问句，作肯定回答)
4. Amy likes playing computer games.(改为一般疑问句，作否定回答)
5. We go to school every morning.(改为否定句_________________________________
6. John comes from Canada（加拿大）.(对划线部分提问___________________________________
7. She is a good student.(改为一般疑问句，作否定回答)__________________________
8. Simon and Daniel like play sports .(改为否定句_________________________________
9. You are Tina. (改为否定句)
10.The books are on the bookcase. (改为否定句)
11..She has a computer game. (改为否定句)
12.We have a big TV in our house. (改为否定句)
13，Is Linda his sister? (作否定回答)
19Where is my book ?(改为复数句子)
人教版小学数学四年级下册新课标解读
崔庙镇实验小学