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Is Mr Bear singing?
Yes, he/she is.
No,he/she isn’t.
What is…doing?
He/ She is …ing
Let’s talk.
Are they…ing?
Yes, they are.
No, they aren’t.
What are they doing?
They are…ing.
Let’s talk.
doing
be +
现在进行时(Present Continuous)：
am
are
is
run
swim
make
drive
play
fish
ing
ing
ing
ing
ning
ming