V-ing
type write drive
typing writing driving
The dolphin __ (swim) in the sea.
is swimming
分别用肯定句和否定句回答以下问题：
Are you writing a postcard？
Yes, I am./No, I am not.
小明正在认真读书。
Xiao Ming is reading carefully now.
I is eating vegetables.
is -> am
get drop forget
getting dropping forget
___ (be) you ___ (play) the piano? It's so loud!
Are; playing
Artists are making a sandcastle at this moment.
What are the artists doing at this moment?
看！舞蹈演员正在跳舞。
Look! The dancer is dancing now.
Right now, Johnny and his younger brother paints a beautiful picture.
paints > are painting
open happen listen
opening happening listening
I ___ (listen) to a song now. But I __ (use) my headphones.
am listening; not using
就斜体部分提问并作答：The retired are shopping at the convenience store.
Where are the retired shopping？
大熊猫正在吃竹子上的叶子。
The giant panda is eating leaves on the bamboo.
Look！The policeman chase the thieves.
chase -> is chasing
perform prefer pretend
performing preferring pretending
Attention! Please make sure that you ___ (read) the notice carefully, or you will make mistakes easily.
are reading
就这个句子提出三个特殊疑问句：
Ms. Green is taking photos in front of the old building.
Who is taking photos in front of the old building？//What is Ms. Green doing in front of the old building？// Where is Ms. Green taking photos？
陈诺真的在玩电脑游戏吗？马上都要考试了！
Is Chen Nuo really playing computer games now? The exam will start soon!
The university students are refering to the notes and prepares for the final exam.
are refering > are referring; prepares > are preparing
consider cancel correspond
considering cancelling corresponding
Student A: I don't see them coming. They must be late.
Student B: Don't worry! They __ (not come) today because they __ busy __ (work) on an important schoolwork now.
are not coming
将以下句子改成过去进行时的否定形态（时间词用last Friday at 7 pm）：The President and the First Lady are greeting guests at the White House at this moment.
The President and the First Lady were greeting guests at the White House last Friday at 7pm.
因为我迟到了，所以老师叫我表演一个节目。我现在正在想要表演什么呢。
Because I am late, the teacher asks me to perform something. Now I am thinking about what to perform.
It's 8am. Instead of cleans the street, the social workers lead the blind people to cross the street.
cleans > cleaning; lead > are leading