Unless you change your mind,I won’t be able to help you. =If you don’t change your mind,I won’t be able to help you. 除非你改变想法,否则我不能帮助你。 I want you to keep working unless I tell you to stop. =I want you to keep working if I dont tell you to stop. 如果我没说让你停,你就得继续干。 【即学即练】 单项填空 ①_____ you have tried it, you can’t imagine how pleasant it is.
A. Unless
B. Because
C. Although
D. When
解析:选A。这里unless意为“如果不”,可以与if...not互换。 ②We don’t keep winning games_____ we keep playing well. A. because
B. unless
C. when
D. while
解析:选B。这里连词unless是“除非”的意思,强调条件。 9. John was studying in his room when he heard screaming.(P38) 约翰正在房里学习,突然听到一声尖叫。 此句型中when作并列连词相当于and then,意为 “正当……时突然”。 【联想拓展】 be doing...when...
正在做……突然…… had done...when...刚做了……突然…… be about to do...when...刚要做……突然…… be on the point of doing sth. when...刚要做……突然…… I was wandering through the streets when I caught sight of a
tailor’s shop. 我正在街上闲逛,突然看到一家裁缝店。 I had just sat down when the light went out. 我刚坐下,突然灯灭了。
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