中考英语重要短语的用法及区别：whether if
<p> 中考英语重要短语的用法及区别：<span word="whether">whether</span>，<span word="if">if</span></p><p> 这两个连词都作“是否”解，引导宾语从句时，两者通常可以互换。</p><p> 但在下列几种情况下,不可用<span word="if">if</span> 代替<span word="whether">whether</span>。</p><p> 1)当<span word="whether">whether</span> 与<span word="or">or</span> <span word="not">not</span>连成词组时。</p><p> <span word="I">I</span> <span word="don">don</span>'<span word="t">t</span> <span word="know">know</span> <span word="whether">whether</span> <span word="or">or</span> <span word="not">not</span> <span word="they">they</span> <span word="will">will</span> <span word="come">come</span> <span word="for">for</span> <span word="our">our</span> <span word="help">help</span>.我不知道他们是否来帮助我们。</p><p> 2)<span word="whether">whether</span> 用在不定式前面时。</p><p> <span word="She">She</span> <span word="hasn">hasn</span>'<span word="t">t</span> <span word="decided">decided</span> <span word="whether">whether</span> <span word="to">to</span> <span word="go">go</span> <span word="or">or</span> <span word="not">not</span>.她还没有决定去还是不去。</p><p> 3)<span word="whether">whether</span>引导的从句放在句首时。<span word="Whether">Whether</span> <span word="this">this</span> <span word="is">is</span> <span word="true">true</span> <span word="or">or</span> <span word="not">not</span>,<span word="I">I</span> <span word="can">can</span>'<span word="t">t</span> <span word="say">say</span>.这是不是真的,我不说(或我说不准)</p>
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