《Online tours》GrammarPPT
第一部分内容：Learning targets
1. To understand the differences between the simple past tense and the present perfect tense.
2. To grasp the expressions with the present perfect tense.
3. To grasp the expressions with the simple past tense.
4. To understand different uses of the present perfect tense.
完成句子。
1. 北京因万里长城而著名。
Beijing _____________ the Great Wall.
2. 这条河是个钓鱼的好地方。
This river is a _______________ fishing.
3. 我三天前听说过这件事。
I _________ this _______________.
4.自从2000年起，他就在上海工作了。
He __________ in Shanghai ______ 2000.
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《Online tours》PPT，第二部分内容：New words
dream vi.& vt. 做梦，梦想
dream about/of 想象；梦想
e.g. Do you often dream at night?
你在夜里经常做梦吗？
I sometimes dream about my parents.
我有时梦见我的父母。
I dream of becoming a teacher.
我一心想当个教师。
Presentation
Daniel 两年前去了北京。
Daniel went to Beijing two years ago.
We use simple past tense to tell what happened in the past.
Daniel 已经在北京居住两年了。
Daniel has lived in Beijing for two years.
We use the present perfect tense to talk about an action that started in the past and continues to the present.
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《Online tours》PPT，第三部分内容：Exercises
1. 三年前他养了只猫做宠物。
He ______ a cat as pet three years ago.
2. 这只宠物猫他养了三年了。
He _________ the pet cat for three______Presentation years.
Presentation
Daniel 上个月买了台新电脑。
Daniel bought a new computer last month.
We use the simple past tense to tell what happened in the past.
Daniel已经买了台新电脑。
Daniel has bought a new computer.
(Daniel has a new computer now.)
We use the present perfect tense to talk about the result of an action.When the action happened is not very important. It may have just happened or happened some time ago.
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《Online tours》PPT，第四部分内容：Summary
1) 一般过去时表示过去某时发生的动作或单纯叙述过去的事情，强调动作；现在完成时为过去发生的，强调过去的事情对现在的影响，强调的是影响。
2) 一般过去时常与具体的时间状语连用，而现在完成时通常与模糊的时间状语连用，或无时间状语。
一般过去时的时间状语：yesterday, last week, … ago, in 1980, in October, just, now等，皆为具体的时间状语。
现在完成时的时间状语：for, since, so far, ever, never, just, yet, till/until, up to now, in past years, always等，皆不确定的时间状语。
共同的时间状语：this morning, tonight, this April, now, already, recently, lately 等。
3) 现在完成时可表示持续到现在的动作或状态，动词一般是延续性的，如：live, teach, learn, work, study, know。
一般过去时常用的非持续性动词有come, go, leave, start, die, finish, become, get married等。
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