I___swim when I was five?, can, could, am, do, ___you help me with my homework,please?, can, could, are, do, She___speak three languages very well., can, could, did, was, We__go to the park yesterday because it, can, can't, couldn't, don't, ___I come in,please?, am, do, can, did, My father__play chess when he was young, can, could, is, does, They__understand the lesson now., could, can, were, did, She was tired,so she__run fast., can't, couldn't, don't, doesn't, __You ride a bike when you were six?, can, do, could, are, I__open the window?it's very hot., can, could, am, did, My sister__draw very beautiful pictures., could, can, was, did, When I was a child,I__climb trees easily., can, could, am, do, It was very dark,so we___see anything., can't, don't, couldn't, aren't

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