八年级下Unit10 Section A 3 Grammar focus–4c课件

Unit 10 Section A (Grammar focus)★教学目标知识目标掌握现在完成时的用法能力目标正确区分现在完成时与一般过去时正确运用for 和since的用法情感目标正确处理并充分利用自己的废旧物品。

★教学重点与难点现在完成时的用法正确区分现在完成时与一般过去时正确运用for 和since的用法★学情分析学生在本单元前两课时现在完成时的学习后，已经对这一时态中表示从过去一直延续到现在的动作和状态常与for或since进行连用有了一定的掌握。

但对于这一知识点还需要进一步强化。

此外，瞬间动词转换延续性动词也是学生学习的一个难点。

★教学方法与手段让学生通过感知、体验、实践等方式学习本课内容。

★学习过程Step 1 Group work出示下面的典型例句，让学生们先自己观察句子结构，对比现在完成时和一般过去时的不同。

1. —How long have you had that bike over there? 那边的那辆自行车你买了多长时间了？—I’ve had it for three years. 我买了三年了。

2. How long has his son owned the train and railway set? 他的儿子拥有这套轨道火车多长时间了？He’s owned it since his fourth birthday. 自他四岁生日起，他就拥有了它。

3. Have you ever played football? 你曾经踢过足球吗？Yes, I did when I was little, but I haven’t played for a while now.是的，当我很小时就踢过，但是现在我有好长一段时间没有踢了。

Step 2 精讲点拨现在完成时表示从过去某一时间开始并一直持续到现在(包括“现在”在内）的动作或状态，可以和表示延续的时间状语for或since 连用。

② Continuation and non-continuation verbs
Warming up
FOR VS. SINCE
点击，播放视频
Warming up
Use for or since to form adverbials of time:
___f_o_r___ 5 years
__s_i_n_c_e__ last Monday
Presentation
二、现在完成时中的谓语动词 在现在完成时中，与“for + 时间段”“since + 过去的时间
点或从句”或“since ＋时间段＋ago”连用的动词必须为延续性 动词。常见的延续性动词有 have，live，teach，learn，work， study ，know 等；常见的非延续性动词（词组）有 come，go， leave，start，die，finish，become，join，buy，get married 等。
Presentation
练一练
1) Becky has been (has been, has become) a doctor for ten
years. She likes her job very much.
2) We are late. The movie has been on
(has started, has been
Presentation
【拓展延伸】含 for 和含 since 的现在完成时的句子有时可互相 转换。 ➢ 我从13年前开始就住在这里。
I’ve lived here since 13 years ago. = I’ve lived here for 13 years. = It has been 13 years since I began to live here.

— No, I haven’t. — Me neither. 3. Have these students ever been to these places?
4.—Have you been to the art museum? —I’ve been to the art museum many times.
— S＿o＿ha＿ve＿I (我也去过). I went there on our last school trip.
6. Let’s go to the space museum. I _’v_e_
_n_e_v_e_r_b_e_e_n_there.
7. — H__a_v_eyou _e_v_e_r v_i_s_it_e_d_the space museum?
— No, I’v_e_ n_e_v_e_r_b_e_e_n_ there. — N__e_it_h_e_r_h_a_v_e__I_(我也没去过).
10. John _h_a_s _n_e_v_er_ b_e_e_n_to the space museum.
5. —How about the nature museum? I’ve been there a few times.
—So have I. I went there on our last school trip.
6. Let’s go to the space museum. I’ve never been there.
4.—_H_a_v_e_ you b__e_en_ to the art museum? —I ’_v_e_ _b_ee_n__to the art museum many times.
5. —How about the nature museum? I_’v_e _b_e_e_n_ there a few times.

人民教育出版社 八年级 | 下册
Grammar
现在完成时表示动作或状态从过去某一时刻开始、一
直持续到现在，多与“since +点时间”或“for +段时间” 连用。for表示“经过(一段时间)”，而since表示“自从 (……以来)”。 常见结构如下： for +表示一段时间的状语
5. Linda is ill. She became ill on Monday. Linda has been ill since Monday.
4b、Fill in the blanks with the correct forms of the verbs in brackets have never been go _(go) 1. I __ __________ (never be)to the water park before .I want to ____ next month before the weather gets too cold.
一段时间+ ago
since +
表示过去的某一时间点
从句
人民教育出版社 八年级 | 下册
Grammar
2.在对现在完成时的时间状语进行提问时，我们常 用how long — How long has Mary been a teacher? — Since two years ago.（since+时间段+ago)/For two years.( for+时间段）. He has lived here since 1991.(since+过去的时间点） 他从1991年起就住在这里了。 He has lived here since he was born.(since+从句） 他从出生起就住在这里。