2）当谓语是行为动词时，一般现在时的构成： ①主语（非第三人称单数）＋动词原形＋其他
如：I often watch TV at the weekends.
②主语（第三人称单数）＋动词的第三人称单数形式＋其他 如：Jim usually visits his grandparents on Sundays.
3、动词三单形式的变化规则：
①
swim-swims
② ，watch-watches，do-does ③ 如：study-studies，fly-flies ④
第13讲 现在进行时
1、定义：表示现在或现阶段正在进行或发生的动作。句中常有now，look，listen等词。 如：I am washing clothes now.
Look! Liu Tao is climbing the tree.
Listen! Jane is singing in the music room.
2、构成：be动词（am/is/are）+ 动词现在分词（V-ing）
3、① 如：read-reading，drink-drinking，eat-eating，look-looking ② 如：write-writing，make-making，ride-riding，take-taking
③ 如：sit-sitting，swim-swimming，put-putting，run-running，stop-stopping，get-getting，
begin-beginning，jog-jogging，forget-forgetting
4、动名词其实就是动词的现在分词，它既有名词性质（可作主语），又有动词性质（可带宾语）。 如：Asking the way
My hobby is collecting stamps. He is good at skating.