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师梦圆初中英语教材同步人教版八年级下册Section A Grammar focus 4a—4c下载详情
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内容预览

The Simple Past Tense and The Present Perfect Tense.

Teaching Difficulties:

The users of kinds of the tenses.

Teaching Periods: 1 period

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

用法

表示过去发生或已经完成的某一动作对现在造成的影响或结果。

e.g. –Have you had your lunch yet?

–Yes, I have. I’ve just had it. (现在我不饿了。)

2. 表示动作或状态从过去某一时刻开始,一直延续到现在,而且可能还要继续下去。

e.g. I haven’t seen her these days.

I’ve known Bob for three years.

I’ve been at this school for over two years.

时间状语

already, yet, just, ever, never, before

构成

现在完成时是由“助动词have / has+ 动词的过去分词”构成的,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。

动词的过去式的变化和过去分词的变化并不完全相同。我们对它们作了一个大致的分类。 (注:例子中单词的变化顺序为:动词原形 → 动词的过去式? → 动词的过去分词)

一、过去式和过去分词的变化相同

规则变化:

1. 一般在动词词尾直接加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; hope → hoped → hoped; phone → phoned → phoned

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