Vincent Teo Can I say, (a) She wrote a book of / about animals. (b) He is laughing to at her. (c) Are you good in at sports?
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Vincent TeoCan I say,
(a) She wrote a bookof /about animals.
(b) He is laughingtoat her.
(c) Are you goodinat sports?
(d) Do not smoke during/ at / in /atthe concert.
(e)
Vincent Teo'During' refers to a period of time when something happens.
Shall I know the reasons?
(d) Do not smoke during/ at / in /atthe concert.