回答

I heard some children sing outside.
I saw her wait at the bus stop.
I heard the door shut behind me.
Music makes us feel happy.
My father let my sister go abroad alone.
I had the waiter bring me some more water.
これは知覚動詞と使役動詞の文法です。
意味はGoogle翻訳で答え合わせもできるので、まずは自分でやって見てください。

I heard some children singing outside.
I saw her waiting at the bus stop.

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