必修5 Unit 5(2)
Remove clothing using scissors if necessary unless it is stuck to the burn.除非衣服紧贴在烧伤面上,否则都要把衣服脱掉。如果需要的话,可以使用剪刀。
unless是连词,意为“除非,如果不”,引导的是一个肯定条件状语从句,从句有时可以与if...not...引导的否定状语从句互换。
①It is known to all that unless_you_exercise_regularly,you won’t keep fit.众所周知,除非你有规律地锻炼,否则身体不会健康。
②We will have a picnic in the park this Sunday unless it rains or it’s very cold.
除非下雨或天很冷,我们将在本周日去公园野餐。
③Unless_you’ve_tried_it,you can’t imagine how pleasant it is.
除非你尝试一下,否则你无法想像那是多么令人愉快。
John was studying in his room when he heard screaming.约翰正在房间里学习,突然听到一声尖叫。
when在此作并列连词用,意为“正在这时;那时”。
be doing...when...正在……这时……
be about to do...when...正打算做……这时……
be just going to do...when...正要……这时……
be on the point of doing...when...正要……这时……
had just done...when刚……就在这时……
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