ni3 chi1 wan2 ni3 de0 zao3 can1 le0 ma1?=have you finished your breakfast?
你 吃 完 你 的 早 餐 了 吗 ?
("0" means you pronounce it lightly,it has no tone ,no 1 2 3 4 ,but say it in a lightly way)
"finish" means"完成 wan2 cheng2"
another example:
have you finished your homework?=ni3 zuo4 wan2 ni3 de0 zuo4 ye4 le0 ma1?
你 做 完 你 的 作 业 了 吗?
if we say the sentance like this:have you had your breakfast?it means just like the first sentance ,with little difference ,in chinese"ni3 chi1 guo4 ni3 de0 zao3 can1 le0 ma1"?