Hi VT I would like to preface my comments about your sentences by reminding you that some sentences are possible to say, but only in a very limited number of contexts. Many of the sentences you post are grammatically acceptable, but may not sound natural or be grammatically appropriate in many (or even most) contexts. Some of the grammatically correct sentences you post sound quite awkward out of context.
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Vincent TeoThey are all possible, but I agree with Ya
Thanks your comments, so my sentences is still consider correct?
(a) We have to write an address on the envelope.
(b) He writes the address on an / the envelope.
(c) She writes an address on an / the envelope.
(d) She writes Peter's address on an envelope.