Question

We ________ any Chinese class on Friday. We ________ an English class now.

1. A.
   aren't having, are having
2. B.
   don't have, have
3. C.
   don't have, are having
4. D.
   aren't having, have

Answer 1

C
解析：本例主要考查一般现在时和现在进行时在一起混用时，如何分辨。一般现在时通常表示经常发生的或习惯性的动作或目前的状态，常与often，always，sometimes，every day，on Sundays／Mondays等表示频度的时间状语连用。如：He often goes to school by bike. He is always ready to help others. 现在进行时表示现在或说话时正在进行的动作，常与now，look，listen等词连用。如：Listen! Someone is singing in the classroom. Please be quiet. Please be quiet. The baby is sleeping. on Friday为一般性时间，不是指哪一周的星期五，所以该句中不能用现在进行时，而应用一般现在时。第二句中的状语now指此时此刻正在上英语课，故用现在进行时。
方法提炼：弄清楚每种时态的用法差异，做题时才不会相互混淆，张冠李戴。