<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><link rel="stylesheet" href="home.css" tppabs="home.css"><link rel="stylesheet" href="eng.css" tppabs="eng.css"></head><body bgcolor="white" text="black" topmargin="10" leftmargin="0" marginwidth="0" marginheight="0"><table width="540" border="0" cellspacing="0" cellpadding="0" align="center" height="15"><tr><td> </td></tr></table><div align="center"><table width="540" border="0" cellspacing="0" cellpadding="0"><tr><td colspan="3" class="p2" width="760"><b>21.5 must表示推测</b></td></tr><tr><td height="254" width="20"> </td><td height="254" width="520" valign="top" class="p2"><br> 1) must用在肯定句中表示较有把握的推测，意为"一定"。<br> 2) must表对现在的状态或现在正发生的事情的推测时， must 后面通常接系动词be 的原形或行为动词的进行式。 <br> You have worked hard all day.You must be tired. 你辛苦干一整天，一定累了。（对现在情况的推测判断）<br> He must be working in his office. 他一定在办公室工作呢。<br><br> 比较： <br> He must be staying there. <br> 他现在肯定呆在那里。<br> He must stay there. <br> 他必须呆在那。 <br> 3) must 表示对已发生的事情的推测时，must 要接完成式。<br> I didn't hear the phone. I must have been asleep. 我刚才没有听到电话，我想必是睡着了。<br><br> 4) must表示对过去某时正发生的事情的推测，must 后面要接不定式的完成进行式。<br> ---Why didn't you answer my phone call?<br> ---Well, I must have been sleeping, so I didn't hear it.<br><br> 5) 否定推测用can't。<br> If Tom didn't leave here until five o'clock, he can't be home yet. 如果汤姆五点才离开这儿，他此时一定还未到家。<br><br></td></tr></table></div></body></html>
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