现在进行时

　　表示正在发生的事情或进行的动作，常与now,listen,look等词连用，结构是主语+be动词(am, is, are)+动词ing.

　　如：It is raining now.

　　外面正在下雨

　　It is six o’clock now.

　　现在6点了

　　My parents are reading newspapers in the sitting room.

　　我父母正在客厅看报纸

　　Look! The children are having a running race now.

　　看！孩子们正在赛跑

　　问句将be动词移前，否定句在be动词后+not.