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The Avengers are running.
1
2
3
is flying.
Black Widow
Iron Man
is talking.
The heroes
are running.
We are having an English class.
1
He
She
They
I am teaching you.
is flying.
is talking.
are running.
We are having an English class.
He
She
They
I am teaching you.
What do these sentences have in common?
(找出这些句子的共同之处)
含义：表示现阶段正在进行或发生的动作。
S(主语)
be
V-ing