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问题: 改错4道

改错
Mum isn't at home. Please look at your brother __________
He is up there in the playhouse and Bill __________
There is no a pencil in the pencil-case. __________
The children under the tree is not his son ___________

解答:

1.Please look after your brother
2.He is up there in the playhouse with Bill
3.There is no pencil in the pencil-case.
4.The child under the tree is not his son