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1、buy bought boughtsend sent sentlend lent lent be (am , is 的过去式是 was are 的过去式是were. 过去分词都是been) go went gone fly flew flown sit sat sat teach tought tought understand understood understood think thought thought make made made get-got-gottenspend-spent-spentwrite-wrote-writenring-ring-rungcome-came-comehave-had-hadpaid-paid-paidsell-sold-soldbring-brought-broughtleave-left-leftsweep-swept-sweptsee-seeing-saw-seentake-took-taken。

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