I like to stand at the door to welcome the children in when they come home from school.

　　孩子們放學回家時，我愿意站在門口迎接他們。

　　As soon as the children came back from school, the toys, which had been put in apple-pie order, were soon in disorder.

　　孩子們一放學回家，原先擺放的整整齊齊的玩具很快就變得亂七八糟了。

　　The children's mother was very concerned for their safety when they didn't come back from school at the usual time.

　　孩子們沒有在通常時間放學回家，母親很為他們的安全擔心。