四大时态要有（概念、构成、标志词）

时态
1．一般现在时
（1）表示经常发生的动作或事情,通常用 “usually,often,every day,sometimes,always,never”等词.
（2）基本结构：
I / You / We / They He / She / It
肯定句（Positive） 动词原形（V） 动词第三人称单数形式（V+S）
否定句(Negative) don’t + 动词 doesn’t + 动词原形
一般疑问句(Yes/No) Do… Yes,I do.Does…(动词原形)…?No,she doesn’t.
特殊疑问句(wh-) What do How does she…(动词原形)…?
(3) 动词第三人称单数形式
a.Most verbs +s walk-walks
b.Verbs ending in a consonant +y -y +ies fly-flies
c.Verbs ending in s,sh,ch or x +es watch-watches
d.Others do-does ,have-has,go-goes
2．现在进行时,
（1）表示正在发生的动作,通常用“now,look”.
（2）基本形式：be + 动词+ing
eg:I am(not) doing my homework.
You/We/They are(not) reading.
He/She/It is(not) eating.
What are you doing?
Is he reading?
（3）动词的现在分词形式（do+ing）
Most verbs +ing walk—walking
Verbs ending in e -e + ing come—coming
Short verbs ending in a vowel + a consonant Double
consonant run-running
swim-swimming
3.一般过去时态
（1） 表示过去已经发生的事情,通常用 “last week,just now,yesterday”等词.
（2） be 动词的过去式:am/is—was are—were
I/He/she/it was(not)….You/we/they were….
一般疑问句was,were 放在句首.
（3）过去式基本结构
肯定句（Positive） 动词过去式 I went shopping last night.
否定句(Negative) Didn’t + 动词原形 I didn’t go shopping last night.
一般疑问句(Yes/No) Did …+ 动词原形…?Did you go shopping last night?
特殊疑问句(wh-) What did…+ 动词原形…?What did you do last night?
(4)动词过去式的变化：
规则动词的变化：
一般动词 +ed planted,watered,climbed
以不发音的e结尾 +d liked
辅音字母加y结尾 -y+ ied study—studied,cry- cried
重读闭音节单词,末尾只有一个辅音字母 双写最后一个字母+ed stop –stopped
plan - planned
不规则动词的变化：
原形 过去式 原形 过去式 原形 过去式 原形 过去式
sweep swept teach taught have had go went
keep kept think thought do did find found
sleep slept buy bought eat ate say said
feel felt drink drank is/am was take took
read read give gave are were mean meant
put put sing sang drive drove meet met
cut cut begin began speak spoke make made
let let ring rang write wrote see saw
fly flew run ran ride rode come came
draw drew sit sat hear heard tell told
grow grew learn learned/ learnt get got know knew
4．一般将来时
一般将来时表示将来打算做的事或将要发生的事情.常常与tomorrow,next Sunday等时间状语连用.
结构：be going to +动词原形
例如：I’m going to visit my grandpa next week.