现在进行时：
关键词：look(看) listen(听) now(现在) 具体时间（几点钟）
结构：am,are,is+ 动词 ing
例： I am cooking
否定句：am,are.is+not + 动词 ing
一般疑问句：am,are,is+动词 ing ……？
肯定回答： yes. 否定回答：No
动词加 ing 的规律：1、直接加ing: go – going; do – doing
2、以不发音的e结尾，把e去掉加ing : write – writing; have – having
3、双写末尾字母加ing : run – running; swim – swimming skip—skipping sit – sitting begin – beginning get – getting put – putting shop – shopping