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read ---
eat ---
was
were
went
had
saw
watched
read
ate
What’s this?
It’s grass.
grass
grass
What can you do on the grass?
I can play football on the grass.
You can play basketball in it.
Sometimes you have a P.E class in it.
Guess. What is it?
gym
I played ping-pong in the gym three days ago.
三月前 three months ago
…….
一天前
one day ago
五周前
five weeks ago
两年前
two years ago
多久以前