用法一: 表示现在经常性或习惯性的动作。(动词用原型，第三人称+s)
1.Tom wears a belt round his waist. 汤姆腰里系着一根皮带。
解析：Tom (第三人称)wears(wear+s 即原型+s) a belt round his waist.
这里表示经常性的、习惯性的动作，Tom 昨天腰里系着一根皮带，今天也系了，明天、后天……或许一直系了着，一直处于这种状态。
2.The train goes backwards and forwards between the two towns. 这列火车在两座城市间来回开。
3. I leave home for school at 7 every morning.
用法二： 观真理，客观存在，科学事实。
The earth moves around the sun.
Shanghai lies in the east of China.
The sick child is better today. 生病的孩子今天身体好点了。
I enjoy songs such as this one. 我欣赏这样的歌曲。
I like all musical instruments except the violin. 除了提琴我什么乐器都喜欢。
用法三： 表示现在的能力、特征、职业等。
He sings well. 他唱歌唱得好。
Mr. Smith teaches French. 史密斯先生教法语。
用法四： 表示客观真理、科学事实、格言以及不受时间限制的客观存在。
Summer follows spring. 春去夏来。
Knowledge is power. 知识就是力量。
The earth turns around the sun. 地球绕着太阳转。
易错点击：
在做题时，错误主要出现在人称及句式变换上。
其句式变化可分为两种情况
1)表示动作， 一般人称作主语的，变否定句须在动词前加助动词don’t;变一般疑问句须在句首加助动词do。
例. They have lunch at 12:00. They don’t have lunch at 12:00. Do they have lunch at 12:00?
2) 单三人称做主语的，变否定句须在动词前加助动词doesn’t;变一般疑问句须在句首加助动词does。
例. Jenny speaks English very well.
Jenny doesn’t speak English very well.
Does Jenny speak English very well?
含有be动词的要在be上做变化.
例. Danny is a good student.
Danny isn’t a good student.
Is Danny a good student?
其时间状语为often、 usually、 always、 sometimes等频率副词，on Saturdays、 in the morning(afternoon evening) 、every day 等。
做题时常见错误如下：
一、be动词与行为动词同时出现在句子中
例：We are plant (plant) the trees in spring.
答案：plant
解析：学生往往会用汉语的思维方式去翻译，就成了“我们是在春天植树”。这是学习英语最忌讳的，要看语法是不是正确，在英语中，be是表状态，do是表动作，两种动词不能同时出现在句子中，可记住如下口诀：“英汉语言有差异，be 、do不能放一起，仔细琢磨细分析，语法千万要牢记。”
专项练习：
一、 单选
1 Jenny ____ in an office. Her parents ____in a hospital.
A work works B works work C work are working D is working work
2 One of the boys_____ a black hat.
A have B there is C there are D has
3 We will go shopping if it____ tomorrow.
A don't rain Bdidn't rain Cdoesn't rain Disn't rain
4 He said the sun ____in the east and ____in the west.
A rose; set B rises; sets C rises, set D rise; sets
5 Wang Mei ____ music and often ____ to music.
A like; listen B likes; listens C like; are listening D liking ; listen
6 Jenny____ English every evening.
A has study B studies C study D studied
答案：1 B 2D 3C 4B 5B 6B
二、填空
1 I can take Li Ming there when he _____ ( come) to visit.
2 _____your sister_____(know)English?
3Her home____ _____ ______(远离 )her school.
4The pot_____(not look) like yours very much.
5 Where _____you____(have)lunch every day?
6 Who_____(想要 )to go swimming?
7 ______she_____(do) the housework every day?
8 Jenny and Danny usually______(play) games in the afternoon .
答案：1 comes 2 Does know 3 is away from 4 doesn't look
5 do have 6 wants 7 does do 8 play
二、单三人称形式易出错
例：1 He plaies (play) football very well.
2 Danny gos (go) to school at 7:10.
答案：1 plays 2 goes
解析：1以辅音字母加y结尾的动词变单三人称形式才能把y换成i再加es;2与名词变复数不同，变单三人称形式以o结尾的词要加es.
三、在句式变换时易出错
例：1 Does Jenny has (has) a good friend?
2 Brian doesn’t lives (not live) in China.
答案：1 Does have 2 doesn’t live
解析：单三人称做主语的一般现在时做句式变化时，可记住如下口诀：“见助动，用原形”。此口诀也可推广用于一般过去时态中。e.g. He didn't go home yesterday.
四、对do的理解易出错
例：We don’t (not do) our homework in the afternoon.
答案：don’t do
解析：do是一个比较难理解的词，它有三个含义: a)是所有行为动词的总称;b)是助动词，无实义;c)是一个具体的行为动词“做，干”。此句中给出的do指“做，干”，not指把此句变为否定句，故须在do前加助动词don’t。
五、对主语的数判断有误
例： Li Ming with me are (be) in Beijing.
答案: is
解析:表面一看是“我和李明两个人在北京”，但with在此做伴随状语，不能做主语，故用is.
另外，宾语从句中，从句部分若是表示客观真理，不管主句是何时态，从句都要用一般现在时;在时间和条件状语从句中，主句表将来，从句要用一般现在时。
