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②能力目标：能把现在完成时运用到具体问题中。
教学重难点：
重点：1.?熟练掌握?already, just,yet?在现在完成时中的用法。
2.?掌握常用动词的过去分词形式。
难点：能正确使用现在完成时
教学过程：
Step 1 Warm up
Read the following sentences we have seen.
Have you read Little Women yet?
Yes, I have./ No, I haven't.
Has Tina read Treasure Island yet?
Yes, she has. She thinks it’s fantastic.
Have you decided which book to write about yet?
Yes, I have. I’ve already finished reading it. It was really good.
Step 2 现在完成时
构成：助动词have / has+?动词的过去分词，规则动词的过去分词构成与过去式相同，不规则动词的过去分词则需逐个记忆。
规则变化：
1.?一般加ed。如：pick?→?picked?→?picked; wish?→?wished?→?wished; stay?→?stayed?→?stayed
2.?以不发音的e结尾的动词后面加d。如：like?→?liked?→?liked; phone?→?phoned?→?phoned
3.?以“辅音字母?+ y”结尾的动词，变y为i，再加-ed。如：study?→?studied?→?studied;
4.?以辅元辅结尾的，双写再加-ed。如：
stop→?stopped?→?stopped; clap?→?clapped?→?clapped
不规则变化：
5.?以不变应万变。如：let?→?let?→?let; put?→?put?→?put; read?→?read?→?read
6.?若中间有双写e，则去掉一个e，单词末尾再加t。如：feel?→?felt?→?felt; keep?→?kept?→kept; sleep?→?slept?→?slept
7.?结尾的字母d变t。如：lend?→?lent?→?lent; build?→?built?→?built; send?→?sent?→?sent
8.?变为以-ought或-aught结尾。如：buy?→?bought?→?bought; bring?→?brought?→?brought; catch?→caught?→?caught; teach?→?taught?→?taught
句式：
1.?肯定句：主语?+ have / has +?过去分词?(+?其它)
2.?否定句：主语?+ have / has + not +?过去分词(+?其它)