现在进行时考点
表说话时或目前一段时间内正在进行的活动；与频率副词，如always，constantly，continually，again等连用，表示说话人的某种感情色彩(赞叹、厌烦、埋怨等)。
We are having English class. The house is being built these days.
The little boy is always making trouble.
考点一：在时间状语或条件状语从句中表示将来正在进行的动作。
Look out when you are crossing the street.
Don't wake him up if he is still sleeping at 7 tomorrow morning.
考点二：表示在最近按计划或安排要进行的动作(这时多有表示将来的时间状语)。
Marry is leaving on Friday.
