文档介绍：现在进行时态
1. 定义：表示现在正在进行的动作。
2. 构成：am( is, are) + 动词的现在分词
The Present Continuous Tense
动词现在分词的构成规律
1) 一般情况下，在动词原形后直接加-ing。如：
work—working do—doing play—playing
2) 以不发音的字母e结尾的动词，去掉e，再加-ing. 如：
dance—dancing come—coming
3) 重读闭音节单词，如果末尾只有一个辅音字母，则双写这一字母，再加-ing。如：
get—getting shop—shopping
run—running swim—swimming
pool
He is swimming in the pool.
They are shopping in the supermarket.
supermarket
playground
He is playing basketball on the playground.
library
He is reading in the library.
playing the guitar
cooking
running
cleaning
doing homework
talking on the phone
writing a letter
注意！
一般现在时与现在进行时
现在进行时是表示一个动作正在发生或进行。
一般现在时表示现在的状态或经常的，习惯性的动作。
一般现在时的功用
1. 表示一直发生的事情、经常发生的动作：
Nurses look after patients in hospitals.
Excuse me, do you speak English?
I get up at 8 o’clock every morning.
It often rains in summer in Beijing.