engage

1.engage是“使…订婚”，不是“跟…订婚”，说“跟…订婚”通常用被动语态。例如：When did he become engaged to her? 注意engaged 后面用to。He engaged himself to her也可以说。注意不可说He engaged her，这句作“他雇用（或聘请）她”解。

2.He was engaged to be married to her和They were engaged to be married都合乎习惯。

3.下面每组里的两句意思相仿，但第一句着重在状态，第二句着重在行动：

• What is he engaged in?
  What does he engage in?
• He is engaged in teaching.
  He engages in teaching

但对于一时的行为，be engaged in和engage in颇有不同。如He is engaged in a game of tennis是“他现在从事于打网球。”He engages in a game of tennis似乎讲不通，He engages in a game of tennis every morning才对。He often（或sometimes，或seldom，或never）engages in a game of tennis也可以说。