助动词be的用法
<p>1） <span word="be">be</span> +现在分词，构成进行时态，例如： </p><p><span word="They">They</span> <span word="are">are</span> <span word="having">having</span> <span word="a">a</span> <span word="meeting">meeting</span>. 他们正在开会。 </p><p><span word="English">English</span> <span word="is">is</span> <span word="becoming">becoming</span> <span word="more">more</span> <span word="and">and</span> <span word="more">more</span> <span word="important">important</span>. 英语现在越来越重要。 </p><p>2) <span word="be">be</span> + 过去分词，构成被动语态，例如： </p><p><span word="The">The</span> <span word="window">window</span> <span word="was">was</span> <span word="broken">broken</span> <span word="by">by</span> <span word="Tom">Tom</span>.. 窗户是汤姆打碎的。 <span word="http">http</span>://<span word="yingyu">yingyu</span>.<span word="chazidian">chazidian</span>.<span word="com">com</span></p><p><span word="English">English</span> <span word="is">is</span> <span word="taught">taught</span> <span word="throughout">throughout</span> <span word="the">the</span> <span word="world">world</span>. 世界各地都教英语。 </p><p>3） <span word="be">be</span> + 动词不定式，可表示下列内容： </p><p> <span word="a">a</span>. 表示最近、未来的计划或安排，例如： </p><p> <span word="He">He</span> <span word="is">is</span> <span word="to">to</span> <span word="go">go</span> <span word="to">to</span> <span word="New">New</span> <span word="York">York</span> <span word="next">next</span> <span word="week">week</span>.. 他下周要去纽约。 </p><p> <span word="We">We</span> <span word="are">are</span> <span word="to">to</span> <span word="teach">teach</span> <span word="the">the</span> <span word="freshpersons">freshpersons</span>. 我们要教新生。 </p><p> 说明： 这种用法也可以说成是一种将来时态表达法。 </p><p> <span word="b">b</span>. 表示命令，例如： </p><p> <span word="You">You</span> <span word="are">are</span> <span word="to">to</span> <span word="explain">explain</span> <span word="this">this</span>. 对此你要做出解释。 </p><p> <span word="He">He</span> <span word="is">is</span> <span word="to">to</span> <span word="come">come</span> <span word="to">to</span> <span word="the">the</span> <span word="office">office</span> <span word="this">this</span> <span word="afternoon">afternoon</span>. 要他今天下午来办公室。 </p><p> <span word="c">c</span>. 征求意见，例如： </p><p> <span word="How">How</span> <span word="am">am</span> <span word="I">I</span> <span word="to">to</span> <span word="answer">answer</span> <span word="him">him</span>? 我该怎样答复他？ </p><p> <span word="Who">Who</span> <span word="is">is</span> <span word="to">to</span> <span word="go">go</span> <span word="there">there</span>? 谁该去那儿呢？ </p><p> <span word="d">d</span>. 表示相约、商定，例如： </p><p> <span word="We">We</span> <span word="are">are</span> <span word="to">to</span> <span word="meet">meet</span> <span word="at">at</span> <span word="the">the</span> <span word="school">school</span> <span word="gate">gate</span> <span word="at">at</span> <span word="seven">seven</span> <span word="tomorrow">tomorrow</span> <span word="morning">morning</span>. 我们明天早晨7点在校门口集合。 </p></p>
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