3.Read the article again. Are the sentences true (T) or false (F)?

1 The global birth rate is 50 percent lower than in the 1960s.
2 Scientists are developing ways to grow food without fields and land.
3 Scientists have shown that all cancer is caused only by smoking.
4 Treatment of cancer has improved a lot over the last 50 years.
5 More than a quarter of China’s electricity comes from solar power.
6 Scientists have discovered how to use water as a fuel

4.Discuss the questions.
1 Did you find any of the facts surprising or worrying?
2 Which of the challenges seems easiest to solve?

5.Find three examples of the present perfect continuous and five examples of the present perfect simple in the article.

Present perfect simple and continuous
Use the present perfect to talk about actions or events that started before now and have a present connection or result.
Use the present perfect simple to focus on the completed action. It often explains how much or how many (including none).
The birth rate h a s fallen since t h e 1960s. (how much)
Use the present perfect continuous to focus on an action that lasts for a period of time and/or that is unfinished now. It often explains how long.
Scientists have also been exploring other ways to u s e the sun’s energy. (action unfinished)
Don’t use the present perfect simple with passive verbs or state verbs.
A lot of money has been invested in cancer research

Complete the sentences with a present perfect form.
Try to use at least three examples of the present perfect continuous.
1 It’s a bit surprising, but I’ve never…
2I ….. for ages.
3 I’m proud of the fact that .…
4 I’d love to do some research on because …
5 I’ve decided to… because
6 I’ve been thinking of…….. because…
7 How long…?
8 Have .?

https://test-english.com/grammar-points/b1-b2/present-perfect-simple-continuous/2

HOMEWORK

1.Analyse active vocabulary and do the tasks

2.Reread the grammar structure of Presenr Perfect and Present Perfect Continious and do the task