buy,lend ,go ,sit,read ,think,get ,write ,come ,pay,bring,sweep,send,be,fly的过去式及过去分词．

buy-bought-bought lend-lent-lent go-went-went sit-sat-sat read-read-read think-thought-thought get-got-got write-wrote-wrote come-came-come pay-paid-paid bring-bought-bought sweep-swept-swept send-sen...