haven的精選

時間和動作的種類1.一般現在時(do/does)2.一般過去時(did)3.一般將來時(will/shalldo),(begoingtodo)4.一般過去將來時(would/shoulddo),(was/weregoingtodo)5.現在進行時(bedoing)6.過去進行時(was/weredoing)7.將來...