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?
" 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.