状语从句知识点总结： unless与if…not…同与异
<p>【导语】英语语法让很多学生都头疼，因为复杂难懂的句式和词组有时难以记忆。英语网为大家整理了英语语法大全，希望对同学们的英语语法学习有所帮助。更多内容尽在英语网。</p><p>1. 当所述条件会结束已经存在的想法或状态时，用或都可以。如：</p><p><span word="We">We</span> <span word="shall">shall</span> <span word="go">go</span> <span word="unless">unless</span> <span word="it">it</span> <span word="rains">rains</span> <span word="tomorrow">tomorrow</span>. =<span word="We">We</span> <span word="shall">shall</span> <span word="go">go</span> <span word="if">if</span> <span word="it">it</span> <span word="doesnt">doesnt</span> <span word="rain">rain</span> <span word="tomorrow">tomorrow</span>. 如果明天不下雨，我们就去。(下雨会结束去这一已经存在的趋向)</p><p><span word="You">You</span> <span word="will">will</span> <span word="be">be</span> <span word="late">late</span> <span word="unless">unless</span> <span word="you">you</span> <span word="start">start</span> <span word="at">at</span> <span word="once">once</span>. =<span word="Youll">Youll</span> <span word="be">be</span> <span word="late">late</span> <span word="if">if</span> <span word="you">you</span> <span word="dont">dont</span> <span word="start">start</span> <span word="at">at</span> <span word="once">once</span>. 如果不马上走你就要迟到。(马上走会结束迟到这一趋向)</p><p>2. 当所述条件会导致一种新的想法或情况时，通常用<span word="if">if</span>，而不用<span word="unless">unless</span>。如：</p><p><span word="Ill">Ill</span> <span word="be">be</span> <span word="angry">angry</span> <span word="if">if</span> <span word="Im">Im</span> <span word="not">not</span> <span word="invited">invited</span> <span word="to">to</span> <span word="the">the</span> <span word="party">party</span>. 如果不邀请我参加聚会我会生气的。(不邀请就会导致生气这种新情况)</p><p>3. 表示虚拟条件只能用<span word="ifnot">ifnot</span>，不用<span word="unless">unless</span>。如：</p><p><span word="He">He</span> <span word="would">would</span> <span word="have">have</span> <span word="died">died</span> <span word="if">if</span> <span word="the">the</span> <span word="doctor">doctor</span> <span word="had">had</span> <span word="not">not</span> <span word="saved">saved</span> <span word="him">him</span> <span word="in">in</span> <span word="time">time</span>. 要是医生不及时救了他，他早就死了。</p><p>4. 若需定再与否定连用，用<span word="unless">unless</span>，不用<span word="ifnot">ifnot</span>。如</p><p>译：如果没有别的人去，我就去。</p><p>正：<span word="I">I</span> <span word="will">will</span> <span word="go">go</span> <span word="unless">unless</span> <span word="no">no</span> <span word="one">one</span> <span word="else">else</span> <span word="does">does</span>.</p><p>误：<span word="I">I</span> <span word="will">will</span> <span word="go">go</span> <span word="if">if</span> <span word="no">no</span> <span word="one">one</span> <span word="else">else</span> <span word="doesnt">doesnt</span>.</p>
页:
[1]