the children are singing happily 句子结构主谓宾那种
Birds are singing happily singing 小鸟在欢快地歌唱
Happily Singing 欢快地歌唱
The students were singing happily when I passed the school hall.
我经过学校礼堂时，学生们正在高兴地唱歌。
Just as he was about to give up, he saw a poor man singing happily on the street.
正当他要放弃的时候，他看到一个穷人在街上快乐地唱歌。
Just as he was about to give up, he saw a poor man on the street eating with his hands and singing happily to himself.
就在他要放弃的时候，他看到一个穷人在街上用手吃东西，并快乐地唱着歌。
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