is和do的關係!?

First of all, you have to understand that the words 'do/does/did' and 'be/is/am/are/was/were' can be a main verb or an auxilliary verb of a sentence/question.

The 'does' and 'is' in your questions are both auxiliary verbs. We put the word 'do/does/did' in a question when there is no auxiliary verb in the question and the main verb of the question is not "is/am/are/was/were".

If there is an auxiliary verb in the question, just put the auxiliary verb in front of the subject of the question. The 'is' in your second question is an auxiliary verb which together with the word 'sitting' makes up a present continuous tense.

If the main verb of the question is 'is/am/are/was/were', just put it in front of the subject.



Who does this umbrella belong to?可唔可以用is呢? No.
The main verb of the sentence is 'belong' and there is no auxiliary verb there. So we have to add the word 'does'.

Excuse me. Is anybody setting there? 可唔可以把is放在anybody後呢? No.
The auxiliary verb 'is' should be put in front of the subject 'anybody'.

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do同is又係點解呢?
DO is a verb and IS is a verb-to be or verb when it is used along .


例如:Who does this umbrella belong to?可唔可以用is呢????? not a correct questionn

Whose umbrella is this?
This umbrella is belonging to Mary.
This umbrella is Mary'sT
This is Mary's umbrella

Excuse me. Is anybody sitting there?
可唔可以把is放在anybody後呢?
為何不呢? it is a question so is must go before anybody.

Answer: yes, somebody is sitting there.
no, nobody is sitting there

Excuse me. Is this/that seat free/occupied?

Excuse me. May I sit down here?

Adjective > is
Verb > do

1. No
2. No, this is a question form,which means you cannot put "is" after "anybody".

2010-11-16 08:39:06 補充：
In Question 2 , you can also write in this way:
Is there anybody sitting there?