一．一般现在时：
1.用法：
(1)反复性或经常性发生的动作或存在的状态；
(2)表示客观真理或事实；
e.g. Tom eats breakfast every morning.
The sun rises in the east and sets in the west.
2.时间状语：
(1)every/each +单数时间名词（day/ month/year/week等）；
e.g. every day每一天；
each month每个月；
every week每个周
(2)频率副词:usually / often / sometimes / always等。
e.g. Mary usually finishes her homework on time.
They often go to the place to have a rest.
3.谓语动词形式：
(1)be动词：am/ is /are;
(2)实义动词：原形和第三人称单数形式（简称三单形式）；当主语为I, you及复数时，谓语动词用原形；当主语为单数时，谓语动词用三单形式。
e.g. Tom goes to school every day.
They often stay at home on weekends.
Mary and I are friends now.
(3)动词三单形式的转换规则：
①一般情况下，直接加“s”；
e.g. help—helps
like—likes
come—comes
play—plays
find—finds
②以s, x, sh, ch, o结尾的动词，加“es”；
e.g. guess—guesses
fix—fixes
teach—teaches
finish—finishes
go—goes
do—does
③以辅音字母加“y”结尾的动词，变“y”为“i”，再加“es”。
e.g. study—studies
worry—worries
try—tries
carry—carries
4. 一般现在时肯定句转换为否定句，一般疑问句及一般疑问句的肯定和否定回答；
(1)含有be动词（am/is/are）的陈述句变为一般疑问句，直接把be动词提到句首,然后把“.”变“?”即可，其中第一人称I和we要相应的变为第二人称you。肯定及否定回答用相对应的be动词来回答就可以了；若是肯定句变为否定句，直接在be动词后面加not，可缩写，可全称；否定回答只能用缩写；
e.g. 肯定句: Tom and Mary are friends before.
否定句: Tom and Mary are not/aren’t friends before.
一般疑问句: Are Tom and Mary friends before?
肯定回答: Yes, they are.
否定回答: No, they aren’t.
(2)含有实义动词的陈述句变为一般疑问句需要请助动词(do/does)，谓语动词为原形请do，反之，请does，然后把助动词提到句首，后面的实义动词必须变为原形；肯定回答和否定回答也用相应地助动词来回答，注意否定回答必须用缩写；若是肯定句变为否定句直接在助动词后面加not变为否定形式，放于谓语动词之前，但切记请了助动词，后面的谓语动词必须变为原形。
e.g.①肯定句: I often go to the zoo.
否定句: I do not often go to the zoo.
一般疑问句: Do you often go to the zoo?
肯定回答: Yes, I do.
否定回答: No, I don’t.
②肯定句: She visits her uncle every year.
否定句: She doesn’t visit her uncle every year.
一般疑问句: Does she visit her uncle every year?
肯定回答: Yes, she does.
否定回答: No, she doesn’t.
二．单项选择题专练：
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