Has 怎么用 主语人称：第三人称单数（she/he/it/Tom/lily/the dog)；
时态：现在完成时、现在完成进行时；
意思：有、已经；
linestart
She has
He has
It has
Tom has
Lily has
The dog has
My mom has
lineend
Have 怎么用
主语人称：第一、第二人称单数和其他人称复数(I/You/We/They/The dogs/My brothers)；
时态：现在完成时、现在完成进行时；
意思：有、已经；
linestart
I have
You have
We have
They have
The dogs have
My brothers have
lineend
Had 怎么用
主语人称：所有人称单复数(I/You/We/They/The dogs/My brothers+ she/he/it/Tom/lily/the dog)；
时态：过去完成时、过去完成进行时；
意思：有、已经；
linestart
She had
He had
It had
Tom had
Lily had
The dog had
My mom had
I had
We had
You had
They had
The dogs had
My brothers had
lineend
否定式
Has not = hasn't
Have not = haven't
Had not = hadn't
