现在完成时
done=过去分词（完成）非谓语
doing(表示一个动作正在进行)
你已经做完功课了。
You have done homework.
单三=have->has
He has done homework.
Tom已经锁门了。
Tom has locked the door.

过去完成时
Have->had
他们已经把水喝了。
They have done drunk the water.
昨天，他们已经把水喝了。
Yesterday ,they had drunk the water.

变一般疑问句
Has Tom locked the door?

特殊疑问句
Why has Tom locked the door?

be 动词
be的过去分词=been
她是一名老师。
She is a teacher.
她已经是一名老师了。
She has been a teacher.

过去式，过去分词

Go=went, gone do=did=done
Be=was/were=been see=saw=seen
Sleep=slept=slept

Break 打破：broke ,broken
Strike 打击：stroke ,stricken
Freeze 冰冻：froze .frozen
Eat 吃：ate ,eaten

Hit 打：hit ,hit
Set 设置：set ,set
Put 放：put ,put
Drink 喝：drank ,drunk
Sing 唱：sang ,sung
Sink 沉没：sank ,sunk

Come 来：came ,come
Become: 成为：became ,become
Stand 站立：stood ,stood
Understand 懂：understood ,understood

这只猫已经睡了3小时了。
The cat has slept for 3 hours.
Marry 已经把这个苹果吃了吗？
Has Marry eaten the apple?
这些人昨天7点就来到我办公室了。
At 7 o’clock yesterday, these people had come to my office.
她把我的书拿走了。
She has taken my book.