"Unless"是一個連詞，意為「除非……如果不……」，常用於引導一個否定意義的真實條件句。以下是一些"Unless"的例句：
我絕不告訴他們—除非你允許。I won't tell them—not unless you say I can.
如果你不積極工作，就會失敗。You will fail unless you work hard.
咱們出去吃飯吧——除非你太累了。Let's have dinner out—unless you are too tired.
除非你已經對她說過了，否則我會很生氣。I will be very angry unless you have already spoken to her.
不要問我解釋，除非你真的不懂。Don't ask me to explain unless you really don't understand.
如果不用信用卡付賬，就請付現金。Unless paying by credit card, please pay in cash.
除非是我記錯了，她是昨天回來上班的。Unless I'm mistaken, she was back at work yesterday.
除非減肥是為了悅已，否則很難保持積極性。Unless you are trying to lose weight to please yourself, it's going to be tough to keep your motivation level high.
這些例句展示了"Unless"的用法，包括其引導的條件句和對主句的影響。