be,have,buy,come,spend,get,wait,meet,drive,swim的第三人称单数,现在分词,

e-is-being-was/were
have-has-having-had
buy-buys-buying-bought
come-comes-coming-came
spend-spends-spending-spent
get-gets-getting-got
wait-waits-waiting-waited
meet-meets-meeting-met
drive-drives-driving-drove
swim-swims-swimming-swam