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What Which How many How much
too, open so, closed too, closed so, open
gone, gone gone, been been, gone been, been
Oh, no, my English is still very poor. How do you know this? Thank you. Really?
Can; must Must; need May; must Need; can
terrible very terrible terribly too terrible
have there are has there is
Could; may Can; must May; must Can; can
taught caught bought brought
the other another student any other student other students
has gone to will go has been went