He's helping Tom study Chinese（同义句）

He's helping Tom study Chinese（同义句）
He's helping Tom_____ _______ Chinese Actually,he is two years younger than Betty(改为同义句） ______ _____,he is two years younger than Betty Maybe Mrs Green will be our new English teacher this term(改为同义句） Mrs Green _____ _____ our new English teacher this term He feels sad because he broke the computer(就画线部分提问）线画在because he broke the computer ____ _____ he ______ sad?