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I’ve been to the art museum many times. Me, too. And I’ve also visited the nature museum.
2. Method Objects in Teaching (1) Explanation method. (2) Exercise methods.
二、教学重难点：
1. Teaching Key Points
1). The present perfect tense. 2). How to use the present perfect tense.
2. Teaching Difficulties To understand and use the present perfect tense.
3. Teaching Aids 1). A computer for multimedia use. 2). A picture.
4.Teaching Procedures
Step 1 Greetings and Revision
Greet the class as usual and check the homework.
Ask students to read the sentences of Grammar focus aloud.
Step 2 Learn the Present Perfect Tense
1. 用法
肯定式否定式
I/You/We/They have (not)finished the work. He/She/It has (not)finished the work.
构成： have(助动词) +V p.p has(第三人称单数助动词) +V p.p
疑问式回答
Have I/you finished the work? Yes, you/I have. No, you/I haven’t.
Has he/she finished the work? Yes, he/she has.No, he/she hasn’t.
have not 常缩略为haven’t has not 常缩略为hasn’t
现在完成时的用法:表示过去发生或已经完成的动作对现在造成的影响或结果。
某些动词的现在完成时可表示过去某一时间开始并一直持续到现在（包括现在）的动作或者状态，可以和表示延续的时间状语连用。表示持续动作或状态的是延续性动词。
ever 意为“曾经”，用于疑问句或否定句中，放在助动词与过去分词之间。
never意为“从来没有”常与before连用，多放在助动词与过去分词之间。??
2. have been to & have gone to区别
比较：He has been to Beijing. 他曾去过北京。（人已回来，可能在这儿）
He has gone to Beijing. 他已经去北京了。（人已走，不在这儿了）。
have / has been (to) 表示“曾经到过某地”，说话时此人不在那里，已经回来。侧重指经历。
have / has gone (to) 表示某人“已经去某地了”，说话时此人可能在路上或已到那里，反正不在这里。
3. 一般过去时与现在完成时的区别