Hi, Can I say, (a) The teacher played the piano to the children. Yes. You could also say 'for the children'.
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Vincent TeoCan I say,
(a) The teacher played the piano to the children. Yes.
(b) They greeted us warmly by cheering and clapping hands. Yes.
(c) We felt happy, because it was a wonderful day. (should I put comma here?) Okay with our without the comma.