外研版（2019） 选择性必修第一册 Unit 6 Nurturing Nature Using language 现在完成进行时 课件-(21张ppt)

(共21张PPT)
U6 Using language
Present perfect continuous
a. Wild animals such as these Tibetan antelopes have now been using these passages for years .
1. Which of these statements is true about sentence (a)
(1) Wild animals started using these passages in the past.
(2) Wild animals used these passages only once.
(3) Wild animals still use these passages now.
a. Wild animals such as these Tibetan antelopes have now been using these passages for years .
b. …before I know it, we have reached Tanggula Station.
What is the difference between the expressions in bold in sentences (a) and (b)
have/has been doing
have/has done
现在完成进行时
现在完成时
动作从过去开始正在进行
动作发生在过去
观察归纳
1. The train has been racing along steadily since it left Xining.
2. All this time, the song “Sky Railway” has been playing inside my head.
3. The journey has been flying by, ...
4. The Qinghai-Tibet Plateau has been attracting people’s admiration for centuries.
5. …passengers from all over the country have been enjoying these magical landscapes..
more sentences with the present perfect continuous tense in the text
现在完成进行时
含义：现在完成进行时表示动作从_________(过去/现在)一直持续到________(过去/现在)
形式：______________
连用的时间状语：all the time, this week, all night, these few days, for..., since...
过去
现在
have/has been doing
a. I have been designing solar racing cars.
我一直在设计太阳能赛车。
b. I have designed five or six different cars.
我已经设计五六辆小汽车了。
现在完成进行时和现在完成时的区别
含义：现在完成进行时强调动作的___________(延续性/结果)，现在完成时强调动作的___________(延续性/结果)
形式：现在完成进行时 ______________
现在完成时 _______________
延续性
结果
have/has been doing
have/has done
2）现在完成进行时往往表示动作在重复，而现在完成时一般不表示动作的重复。
例如：
a. I have been taking part in races for four years.
我这四年一直在参加比赛。
b. How many races have you taken part in
你参加多少场比赛了？
现在完成进行时和现在完成时的区别
3）现在完成进行时与所有进行时态一样带有感彩，可使表达显得生动，而现在完成时往往只表明一个事实、一种影响或结果，不带感彩。
例如：
What have you been doing You looked fed up.
你一直在干什么呀？你看上去很不高兴。
现在完成进行时和现在完成时的区别
Pay attention to the expression in red and underlined.
1 The train has been racing along steadily since it left Xining.
2 All this time the song “Sky Railway” has been playing inside my head.
3 Wild animals such as these Tibetan antelopes have now been using these passages for years.
观察归纳
4 The Qinghai-Tibet Plateau has been attracting people’s admiration for centuries.
5 Now, thanks to our efforts, passengers from all over the country have been enjoying these magical landscapes.
现在完成时常与all this time, now等时间状语以及由since或for引导的时间状语连用。
总结 例句
常搭配的时间状语 现在完成进行时常与表示一段时间的状语连用，例如：all the time, this week, all night, these few days以及由since和for引导的短语或从句 My sister’s been writing letters all night.
He is ill. He’s been lying in bed for three weeks.
We’ve been living in this city since we got married.
现在完成时的标志时间：already, yet, so far, never, ever, recently, up till now持续不断进行, in the past/last...years.
现在完成进行时
总结 例句
构成 have / has + been + 动词-ing形式 Tom has been watching TV programmes since seven o'clock this evening.
I have been working here for five years.
总结 例句
用法 表示一个由过去某一时间开始一直持续到现在的动作(可能刚结束，也可能还要进行下去)。 I've been doing my
housework all morning and I've just finished it.
How long have you been
wearing glasses
有时表示动作的重复。 David has been coughing a lot lately. He ought to give up smoking.
有时带有感彩。 Too much has been happening today!
1. The first use of atomic weapons (原子武器)was in 1945, and their power ____________________(increase) ever since.
2. Years ago we didn’t know this, but recent science ___________(show) that people who don’t sleep well get ill easily.
3. —Look! Somebody ___________(clean) the sofa.
—Well, it wasn’t me. I didn’t do it.
4. —How long ___________ you ______________(work) in the factory —Since 1990.
Let’s practice
has been increasing
has shown
has cleaned
have been working
5．In order to find the missing child, villagers _______________ (do) all they can over the past five hours.
6．The manager _______________(tell) the workers how to improve the program since 9 am.
7．The two friends __________________(chat) on the Internet for three hours, and they will go on till next morning.
Let’s practice
have been doing
has been telling
have been chatting
I 1 _______________(hear) a strange sound for a while. It`s a deep, loud roar, like a lion`s .But there aren`t
any lions here… Or are there Soon I see what 2______________(make) the noise: a howler monkey. Now I feel less worried. Realizing that something 3____________(move) on my shoulder, I turn my head to look at it . Oh no! It`s a giant spider! I brush it off and it runs under some leaves.
Complete the passage with the correct form of the verbs in brackets.
have been hearing
has been making
is moving
I try to bat away the huge insects, which 4_______________(fly) around my head in a black cloud for quite a while.
I pull off the headset and I`m back in my living room. Thank goodness! I5______________(give) the latest virtual reality headset and, for the last twenty minutes, I 6_____________(use) it to explore the Amazon.
Complete the passage with the correct form of the verbs in brackets.
have been flying
have been given
have been using
This is an amazing experience and a reminder to how many species there are in the rain forest. We must do all we can to protect it .
Complete the passage with the correct form of the verbs in brackets.
Look at the charts and make sentences using the present perfect continuous tense.
The number of trees has been increasing/rising in the last 20 years.
increase
增加
rise
Look at the charts and make sentences using the present perfect continuous tense.
Desert areas have been reducing/decreasing in the last 20 years.
decrease
减少
reduce
Look at the charts and make sentences using the present perfect continuous tense.
Butterfly population has been increasing / has becoming larger and larger in the last 20 years.