8B Unit 1 Past and PresentGrammar

Learning aims:1. Master the structure and basic usage of present perfect tense (PPT).(掌握现在完成时的基本结构、用法。)

2. Learn the rules of forming the past participle of verbs.(学习动词的过去分词变化规则。)

3. Learn some time expressions usually used in PPT.(学习常用在现在完成时里的时间表达方式。)

We use the present perfect tense to talk about an action that started in the past and continues to the present.表示过去开始，现在还在继续的 动作。

We use the present perfect tense to talk about an action that happened in the past and has a connection with the present.

表示过去发生的或已完成的动作对现在造成的影响或结果。

Eddie has eaten my food.

Past

presentEddie ate the food and now Hobo has nothing to eat.

We also use the present perfect tense to talk about how many times an action has happened till now.谈论动作已经发生了很多次。 I have already read this book many times.

We use the simple past tense to talk about what happened at a definite time in the past. (一般过去时谈论在过去的特定时间发生的事)

Step3: While –task

Task1: Group workMake a conclusion about the basic structure of PPTSubject (主语)

have / has + (not) (助动词) have (not)has (not)

past participle (过去分词) moved.moved.

I/You/We/TheyHe/She/It

一般疑问句 Have/ Has + 主语 + 动词的过去分 词 Have I/you/we/they moved? Has he/she/it Yes,

I/you/we/theyhe/she/it I/you/we/they he/she/it

have.has. have. not/haven’t. has not/hasn’t.

No,

Adverbs of time already: 肯定句，表示已经发生 ever: 疑问句，表示“曾经” for: 肯定句/疑问句/否定句，表示一段时间 just: 肯定句，表示“刚刚” never: 否定句，表示“从不” recently: 肯定句/否定句/疑问句，表示“最 近” since: 肯定句/否定句/疑问句，表示“自---以 后” yet: 疑问句/否定句，表示“已经”或者“还 没有”