：
现在进行时的构成：Be+v+ing. 助动词be的形式要根据主语的人称和数来决定。
1、现在进行时的标志：Look!Listen!Now等词
2、现在进行时的基本用法：
a. 表示现在( 指说话人说话时) 正在发生的事情或当前一段时间内的活动或现阶段正在进行的动作。
We are waiting for you.
I’m doing my homework now.
They are watching TV.
b. 习惯进行：表示长期的或重复性的动作，说话时动作未必正在进行。
Mr. Green is writing another novel(小说).
(说话时并未在写，只处于写作的状态。)
3、动词-ing的变形规则
1）一般情况直接加-ing。
Play—playing look—looking go—going
2）以不发音的e结尾，去e加ing。
Write—writing take—taking close—closing
3）重读闭音节，双写末尾的字母，再加ing。
Swim—swimming put—putting run—running
练习一（写出下列单词的-ing形式）
1
begin
2
come
3
eat
4
know
5
show
6
sit
7
speak
8
go
9
see
10
do
11
have
12
wear
13
ride
14
feel
15
study
16
sing
练习二（用所给单词的适当形式填空）
1.Look!The grandma ________(run)after the grandson.
2.Listen!The students _______(sing)an English song.
3.Don’t go out.It___________(rain)hard now.
4.Tom _______(read) a book now.
5.The children _________(not listen) to the music now.
6.Are they _______(have) breakfast now?
7.Is your father _________(fish) now?