题目内容
4．Ann usually plays the piano in the room．（用now替换usually改写句子）Annis playing the piano in the room now．
分析 安总是在屋子里弹钢琴．
安正在屋子里弹钢琴．
解答 答案：is playing．结合now表达的是现在正在进行的动作，故用现在进行时be+doing，主语Ann故is，故答案是is playing．
点评 可用来表示现在进行时的时间状语，常用的有：now，this week，at the moment，right now 等；或者告诉你一个准确的现在时间，或者用look，listen（常用于句子的开头，表示提醒听者注意正在发生的事情）．
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