These two sentences, make any differences?
Do they the same?
Are they the same?
"Do they the same?" is ungrammatical.
DO + VERB
EX: Do they live there?
EX: Do we have to go?
BE + NOUN or ADJECTIVE or PARTICIPLE
EX: Are they the same? <noun>
EX: Was it cold? <adjective>
EX: Is he sleeping? <participle>
The verb BE has many forms; e.g., is, am, was, were, are, be, been.
thank casiopea... I have another question.. "Do we have to go?'" is a present tense. Normally, we use present tense to refer fact and repeated action. how about that sentence? refers to fact or repeated action?
Originally Posted by Casiopea
these only can use on constructing question?
No. Statements too. For example, insert DO (do, does, did) for emphasis.
emphatic DO: I do want to marry you!
As for BE (is, am, are, was, were, etc.), it's an auxiliary verb.
copular: She is a doctor. Is she a doctor?
part of the progressive/continuous tense: He is eating. Is he eating?