How long have your parents been married ?
表達(dá)：你父母結(jié)婚多久了? 意思非常準(zhǔn)確.
How long 常提問一段時(shí)間,用在現(xiàn)在完成時(shí)中.

同義句不能是 how long did your parents got married?
可以是：When did your parents get married ?

how long 根據(jù)需要可以提問現(xiàn)在完成時(shí),過去完成時(shí),一般將來時(shí)等.
例如：
How long will you stay in Shanghai?
How long had he lived in Nanjing before he came here?

在沒有時(shí)間狀語(yǔ)的情況下,要根據(jù)對(duì)句意的理解來確定用什么時(shí)態(tài).????????ù????????????????????????????