<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>21.7 情态动词+ have +过去分词</b></td></tr><tr><td height="254" width="20"> </td><td height="254" width="520" valign="top" class="p2"><br> 1) may(might) have + done sth, can (could) have + done sth 表示过去，推测过去时间里可能发生的事情。<br> Philip may (might) have been hurt seriously in the car accident.<br> Philip can (could) have been hurt seriously in the car accident.<br><br> 2) must have +done sth，对过去时间里可能发生的事情的推测，语气较强，具有"肯定"，"谅必"的意思。<br> ---Linda has gone to work, but her bicycle is still here.<br> ---She must have gone by bus.<br><br> 3) ought to have done sth, should have done sth<br> 本应该做某事，而事实上并没有做。否定句表示"不该做某事而做了"。<br> You ought to (should) have been more careful in this experiment.<br> He ought not to have thrown the old clothes away.（事实上已扔了。）<br> ought to 在语气上比should 要强。<br><br> 4) needn't have done sth 本没必要做某事<br> I dressed very warmly for the trip, but I needn't have done so. The weather was hot.<br><br> 5) would like to have done sth 本打算做某事 <br> I would like to have read the article, but I was very busy then.<br><br></td></tr></table></div></body></html>
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