Ex. 86 Open the brackets using the proper tense-forms of the verbs in the main and subordinate clauses

Ex. 85 Read the text 'Living in the Skies' paying attention to the use of tenses in complex sentences with clauses of time and condition. Ask and answer questions about the text using when and if-clauses

Practice

Referring to the Future

Unit 8 Clauses of Time and Condition

In complex sentences with the subordinate clauses of time and condition the future tenses are used only in the main (principal) clause. In the subordinate clause actions referring to the future are expressed by the Present Simple of the Present Perfect tenses.

Clauses of time are introduced by the conjunctions when, while, as soon as, after, before, until, till

I’ll pay you back when I next see you.

Will yon feed the cats while I'm away?

As soon as Ann and Bob have got married, they'll move to California.

I’ll have a bath before I go to work.

After we've finished the building work, things will be easier.

We won't make any decision until he arrives.

We'll support them till they have found work.

Clauses of condition are introduced by the conjunctions if, in case, unless, provided, on condition that, as long as, so long as

If you come tonight, I'm sure you'll have much. inn.

I'll buy a chicken in case your mother stays for lunch.

I’ ll take the job unless the pay is too low.

We ’ll arrive on time provided the train doesn’t stop again.

We'll play another game so long as you are not feeling tired.

You can use my car on condition that you drive it carefully.

Note: Remember to use one of the Future Tense inobject clauses after the conjunctions if (whether) and when.

Iwonder when I willget my typewriter back.

I'm not sure if (whether ) he will be able to continue in this job.

I don't know ifhe will be here when you phone tomorrow morning.

Where will people live in the twenty-first century? Imagine a building one third of the height of Mount Everest, built robots, and containing a whole city. Imagine you can walk out of your front door in a T-shirt and shorts on a cold winter day and take a lift down 500 floors to school. Imagine you can see the sea a mile below you. Imagine you can never open a window. Imagine...

Well, if Japanese architects find enough money for their project, in the 21st century you'll be able to live in a building like that. Ohbayashi Gumihas designed a two-kilometre high building. Acropolis, which will stand right in the middle of Tokyo Bay. Over 3000,000 people will live in it. It will be 500 floors high, and in special lifts it will take just 15 minutes to get from top to bottom. Restaurants, offices. Hats, cinemas, schools, hospitals, and post offices will ail be just a few lift stops away. According to the architects, Aeropolis will be the first "city to touch the skies".

When we get to the end of this century, Tokyo will have a population of over 15 million people, said design manager Mr Shuzimo. 'There isn't enough land in Japan. We're going to start doing tests to find the best place to build it. I hope people will like living on the 500^th floor."

Won't people want to have trees and flowers around them? 'We're going to have green floors, where children can play and office workers can eat their lunch-break sandwiches,' explained Mr Shuzimo. What about fires? 'If there is a fire, it will be put out by roots. I hope we'll get the money we need to build. As soon as we do, we'll start. This will be the most exciting building in the world'.

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