Did 還是 Have ?

Have you eat(en) lunch yet ?

Do的例句
Do you are boy？

Have的例句
Have you eat dinner？

He/She/It用is
I用am
We/You/They用Are

例句：
She is my mother.
I am a boy.
We are eating lunch.

Have you have had your lunch yet?
Yes, I have already had my lunch.

Did you have lunch with Mary yesterday?
Yes, I had lunch with Mary yesterday./

Do you usually have lunch at 12 O'clock?
Yes, I usually have lunch at 12 O'clock..

Eat lunch - not proper English although people understand what you mean

Is she your sister?
Yes, she is my sister.

Are May & Mary your sisters?
Yes, they are my sisters.
No, they are not my sisters.

Are you my sister's classmate?
Yes, I am your sister's classmate.
No, I am not your sister's classmate.

Am I clever?
Is the dog (it) clever?
Is Tom (he) / Mary (she) clever?
Are Mary & Tom clever?
Are they/ you/ we clever?


Present tense =現在式
Am = I am....
is = he/she/it is
are = you/ we / they

Do you/ we/ they work hard?
Yes, you/we/ they work hard.

Does he/she/it work hard?
Yes, he/she/it works hard.

Present perfect tense (現在完成式)

Have I/we/ they/you worked hard?
Yes, I /we/ they/ you have worked hard
No, I／ｗｅ／ｔｈｅｙ／ｙｏｕ have not workded hard.

Has he/she/it worked hard.?
Yes, he/she/it has worked hard

Past tense過去式
Am/is = was (I/ he/ she/it)
are + were ( we/you/ they)


has/have = had ( all of the above)

Have you eaten/had lunch yet?

最近我上載了一些錄像在Youtube，解釋一些基本的文法規則，希望可以幫到你。
http://www.youtube.com/watch?v=ceFJv0GATcY

下一個錄像(將在明天或後天上載)正正回答你的問題

'Have you eat lunch yet?' is correct.

When a sentence use 'do', it's means someone ask a 事實;
when a sentence use 'have', it's means someone ask a 動作;
when a sentence use 'is/are', it's means someone ask a 數量.


Some example sentence foe 'do':
1. Does you like playing badminton?
2. Does you go work by bus?

Some example sentence foe 'have':
1. Have you finish your homework?
2. Had you go to Disenyland?

Some example sentence foe 'is/are':
1. Are there any apples?
2. Is there any honey?
======================
P.S.: No sentence cau put 'am' in the front!

eat lunch﹖噢你的主啊﹗問人食晏未可直接問having lunch yet﹖唔使用did，你唔會問人前日或上個禮拜食咗晏未﹗