一般现在时，表示习惯性、永久性、反复发生的动作，特征和能力，现在的状况、性质，客观真理，事实。
Seldom does he eat meat.
She loves English.
The earth moves around the sun.
I'll tell her when she comes tomorrow.
He leaves next week.
As I write, the war has broken out.
The contract holds good.
Chaucer writes that love is blind.
现在进行时表示现在正在进行的动作。
The kettle is boiling.
John is losing his hair.
I am making a PPT for my classmate.
It is always raining here.
She is always doubting my words.
The boy is hitting the dog.
My head is splitting.
I am wondering whether I may come a little late.
The book is being printed.
一般过去时表示过去一段时间内发生的动作或状态。
Never did he smoke.
She said that she wouldn't leave until he came back.
I didn't know you were here.
She said that the investigation started the next day.
We often swam in this river.
The woman in the picture was my mother.
My grandfather was a party member.
Jane did a lot of work this morning.
How did she paint the wall?
Did you see the movie The Sound of Music?
Where did I put my wallet?
What was her name?
He told me that he was only 18.
过去进行时表示过去某一时刻正在发生的动作，这个动作可能尚未完成，或过去反复做的动作。
He was playing tennis at five yesterday afternoon.
She told me to wake him up if he was sleeping.
While I was sleeping, there was noise outside.
He was forever grumbling.
I was reading about it in the newspaper.
As I was saying, love makes the world go round.
"Did they catch her?" Mary was asking.
希望我能帮助你解疑释惑。
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