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B: No, I don’t . I _____ already _____ (buy) one .
2. _____ you ever ______(be) to Paris?
3.A:Where is your mother ?
B: She ________ (go) shopping today.
4. I _____________ ( not finish) the homework yet.
5.Li Lei _____ just _____ (give) the cakes to Polly..
6. There _______(be) great changes in Rugao these years.
7.My father ________(go) to Beijing . He isn’t at home .
8 I _____never______ (be) to London ?
Step2: Presentation
现在完成时表示到目前为止已经完成，并对现在留下某种后果和影响的动作。
现在完成时的构成：have/has + 动词的过去分词
注：动词过去分词的构成分为规则变化和不规则
变化，规则变化的动词过去分词与过去式是一样
的，不规则变化的动词须特殊记忆。
Step 3: go on revising the second usage :
现在完成时的用法：
1. 表示已完成的某一动作对现在造成的影响或结果
1） 标志词:
already:多用于陈述句，位于have/has后，有时位于句末。
e.g. I have already finished my homework.
yet:用于疑问句和否定句，位于句尾。
e.g. Have you found your lost book yet ?
I haven't had breakfast yet.
ever :多用于疑问句，问初次经历。
e.g. Have you ever been to Beijing?
never:用于否定句，位于have/has后
e.g. He has never argued with other people.
just :多用于陈述句，位于have/has后
e.g. Lucy has just washed her clothes.