句型转换 1.The headmaster saw the children playing on the playground.(改为复合句)1.The headmaster saw the children playing on the playground.(改为复合句) The headmaster saw the children _____ _____ on the playground.2.The headmaster saw

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句型转换 1.The headmaster saw the children playing on the playground.(改为复合句)
1.The headmaster saw the children playing on the playground.(改为复合句)
The headmaster saw the children _____ _____ on the playground.
2.The headmaster saw the children play on the playground.(改为复合句)
The headmaster saw the children _____ _____ on the playground.

1.were playing
看到学生在玩耍,正在进行.
2.played.
看到学生玩耍的整个过程
第二个怎么填两个词不会.

The headmaster saw the children were playing on the playground.
The headmaster saw the children had played on the playground.