現在完成時三大高頻考點
“have (has) +動詞過去分詞”構成現在完成時。例如：
Kate's never seen Chinese films，____ ?
A. hasn't she B. has she C. isn't she D. is she
析：陳述句部分含否定詞never,簡略問句部分要用肯定式，又因Kate's是Kate has的縮寫，故選B。
2. His uncle has already posted the photos to him. (改爲否定句)
His uncle ______ posted the photos to him ______.
析：already常用在肯定句中，yet常用在否定句、疑問句中，故填hasn't, yet。
3. -Ann has gone to Shanghai. -So ______her parents. A. has B. had C. did D. have
析："so+助/系/情態動詞+主語"結構中的動詞形式應與前句結構中動詞形式保持一致，又後句的主語爲her parents是複數,故選D。
二，考查其用法與標誌詞
(一)當句中有never, ever, just, already, yet, before等時，常用現在完成時。如：
1. -Mum, may I go out and play basketball? -______you______ your homework yet?
A. Do; finish B. Are; finishing C. Did; finish D. Have; finished
2. -______ you ______anywhere before? -Yes, but I can't remember where I______
A. Did; surf; surfed B. Have; surfed; surfed
C. Did; surf; have surfed D. Have; surfed; have surfed
析：據yet和before可知,應用現在完成時，故1題選D，2題選D。
(二)當句中有"for +段時間"或"since +點時間"等時，主句常用現在完成時，謂語動詞必須是延續性動詞，若是非延續性動詞，要改爲延續性動詞或表狀態的詞(短語)。如：
1. His brother has been to Stone Forest twice______he came to Yunnan.
A. after B. before C. since D. for
析：主句用的是現在完成時，而從句用的是一般過去時，故選C。
2. Tom______the CD player for two weeks.
A. has lent B. has borrowed C. has bought D. has had
析：A、B、C均爲非延續性動詞，在肯定句中不與表"段時間"的短語連用，故選D。
3. I______a letter from him since he left.
A. didn't receive B. haven't got C. didn't have D. haven't heard
析：據since可知，應排除A、C，"hear from sb.=receive/get/have a letter from sb."意爲"收到某人的來信"，故選B。
考查have/has been (to, in)/have/has gone (to)的區別。如：
1. -Have you ever______Lintong to see the Terra Cotta Warriors? -Yes, I have.
A. went to B. gone to C. been in D. been to
析：據句中的have，排除A，B項意爲"去某地了"，C項意爲"一直呆在某地"，D項意爲"去過某地"，符合題意，故選D。
2. My parents ______ Shangdong for ten years.
A. have been in B. have been to C. have gone to D. have been
析：本題句中有"for+段時間"結構，據此可排除C，B項意爲"去過某地"，不合題意，D項缺介詞，故選A。
三，考查現在完成時與其他時態的聯繫和區別。如：
1. Sun's aunt has gone there for ten years.(改成正確的句子)
析：非延續性動詞與"段時間"連用時，除了把非延續性動詞改成延續性動詞外，還可把動詞改爲一般過去時或藉助句型"It's +段時間+since+從句"進行句子轉換。故答案爲：Sun's aunt has been there for ten years. /Sun's aunt went there ten years ago. /It's ten years since Sun's aunt went there.
2. Susan has been in this city for more than ten years.(改爲同義句)
________more than ten years ____Susan ______to this city.
析：據上題分析，且since引導的從句要用一般過去時，故填It is, since, came。
3. I won't go to the concert because I ____my ticket.
A. lost B. don't lose C. have lost D. is coming
析：因我丟了票的動作發生在過去，而且對現在造成了我不能參加音樂會的結果，符合現在完成時所表示的含意，故選C。
