Vincent Teo Can I say, (a) She buy some books for her preparation of the trial exam. (b) She is a kind and a helpful girl. (c) He helps to mop the living room.
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Vincent TeoCan I say,a) When does this take place (buying the books)? Past, present or future? The form of "buy" will depend on that! You could say "she's buying", "she bought"
(a) She buy some books for her preparation of the trial exam.
(b) She is a kind and a helpful girl.
(c) He helps to mop the living room.
Vincent TeoCan I say,
(a) She buys some books for her preparation of the trial exam.
(b) She is a kind andahelpful girl. You do not need to repeat "a" here, unles you intend to emphasise the statement.
(c) He helps to mop the living room.