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quá khứ của is/ are
was/were
quá khứ của DO
DID
quá khứ của SEE
SAW
What could you do when you were small?
I could______
than/tree/ a/ jump/ higher/ could/ I
I could jum higher than a tree
climb/ highest/ could/ the/ I/ mountain
I could climb the highest mountain.
in/ swim/ cold/ river/ could/ I/ a
I could swim in a cold river.
Find the mistake: I can swimming
swimming => swim
Find the mistake: What can you do when you were 5 years old?
can => could
