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am doing is doing are doing did
are used to take a walk；am used to swim are used to take a walk；am used to swimming used to take a walk; used to swim used to take a walk；am used to swimming
Must; can’t May; must Can; mustn’t Can’t; can
It can’t be better I don’t think so I think it is not OK I can’t say anything
When do you think we can meet Do you think when we can meet When do you think can we meet Do you think when can we meet
Yes, I am Yes, I can I can swim I don’t know
do I can I do they can they
am doing is doing are doing did
other students any other student the other student any other students
I’m afraid not I hope not. I think possible Yes, there will
I think so I disagree That sounds good Good luck
No, we can’t Yes, we can’t Yes, we can No, we can
between through across over
swim play basketball sing speak English
to step of stepping to fall of falling
swim to swim swimming swims
swim , swim swimming , swim swim , swims swimming, swims
When do you think we can meet Do you think when we can meet When do you think can we meet Do you think when can we meet
Can; good Do; good Can; well Do; well
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