语法知识(时态)1. 现在进行时:(标志词:now, look, listen) (be动词am, is, are)+动词ing2. 现在时:(标志词:always, every day) 动词原形 (三单:he, she,单个人名) 动词+s3. 过去时:(标志词:yesterday, last) 动词+ed(特殊变化:have-had, eat-ate, go-went, see-saw, get-got)4. 将来时:(标志词:tomorrow,next) will+动词原形, be going to+动词原形, be+动词ing+将来时间标志词1. What is he doing now? He is playing football. (现在进行时)他现在正在做什么? 他正在踢足球。2. What do you often do on Sunday? I often visit my friends.(一般现在时)你星期日经常做