now需要加doing，表示正在进行时。

基本结构：be+doing，时间状语：now如：He is writing a novel now. 他目前正在写一部小说。I am eating now. 我正在吃饭。They are having class now.他们正在上课。I am dancing now.我正在跳舞。He is watching TV now.他正在看电视。