until unless 区别

意思一点也不一样 until 是直到 unless 是除非
He did not work until I asked him to
他直到我要他做他才开始工作(我不叫他做他就不工作)
not...until 不到...不..(直到...才...)
He did not work unless I asked him to.
他不工作除非我叫他做(我叫他做他才工作)
unless 除非