worry的过去式_worry的过去式怎么写( 五 )

（三）现在完成时常见考法
对于现在完成时的考查，多以单选、句型转换或词语运用的形式考查学生在具体语境中灵活运用时态的能力。在考试中，会让大家判断是否该用现在完成时，或者是考查“瞬间动词”不能与表示一段时间的状语连用”这一知识点。
【典型例题】
His father_____the party since 1978
A.joind
B.has joined
C.was in
D.has been in
答案：D
解析：本题考查学生对现在完成时的熟练掌握。since 1978表达“自从1978年一直到现在”，表示这件事情从过去一直持续到现在，应该用现在完成时，而且动词必须是延续性动词，A、B均为瞬间动词，不能与时间段连用，故排除；C为一般过去时，也不行。
过去分词的规则变化
动词过去分词的规则变化与动词过去式的规则变化相同。
① 一般情况下，在词尾直接加“ ed ” 。
work---worked---worked
visit---visited---visited
② 以“ e ”结尾的动词，只在词尾加“ d ” 。
live---lived---lived
③ 以“辅音字母 + y ”结尾的动词，将 "y" 变为 "i"，再加“ ed ” 。
study---studied---studied
cry---cried---cried
④ 重读闭音节结尾，末尾只有一个辅音字母，先双写该辅音字母，再加“ ed ” 。
stop---stopped---stopped
drop---dropped--dropped
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过去分词的不规则变化

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【典型考例1】
----Is everyone here, Jonathan?
----No. Sir. Millie is absent. She for two days.
A.has fallen ill B. has been ill C. fell ill D. was ill
【析】正确答案B 。句意是：乔纳森，人到齐了吗？老师，没有。米莉缺席了。她生病已经两天了。Fall ill与be ill都表示“生病”，但fall ill为非延续性动词，在现在完成时中不可与段时间连用，须转换为be ill才可以，所以，正确答案为B 。
【典型考例2】
---Jenny, your new tape player looks great.
----Oh, it’s not new. I _____ it for three years.
A.buy B.have had C.bought D.have bought
【析】正确答案：B 。句意是：詹妮，你的新随身听看上很不错啊！哦，它不是新的。我已经买了3年了。非延续性动词buy在现在完成时中，不可与段时间状语连用，因此，须转换为延续性同义动词have或own 。所以，正确答案为B。
【强化练习】
一、根据汉语意义或首字母提示，写出正确单词。
1. I haven’t ________ (收到…来信) from Sally before.
2.I’m very hungry . I haven’t e_______ anything since 7:00 this morning
3. Bob and Jim have been good friends_______(自从)they joined the same tennis team.
二、用所给单词的正确形式填空
1.The writer is so popular that he _______(sell) more than 200,000 books so far.
2.---I____ (have a fever)since last night.
---You’d better go to see a doctor.
3.So far, the couple ___________ (not change) their flat since they had a second child.
4.Jim has never ________(be) to Mount Tai in China.
5. Sandy borrowed the novel from the library last week and ________(keep) it for 5 days.
6.Cathy and Linda ( not be) back to their hometown for two years.
7.----Can you go walking in the park with me, Daisy?
----Sure. I (finish)my DIY project.
三、单项选择
1.（2019山东临沂） Melting ice (融冰) can cause sea levels to rise. Since 1993, sea levels _________at a speed of 3.2 cm every 10 years.
A. rose
B. have risen
C. rise
2.（2019安徽）—It's ten years since we came here
—How time flies! We ____ in China for so long.
A. work
B. worked
C. will work
D. have worked