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
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.

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
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.