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 The world is awash with oil, yet it is also on the brink of a shortage -  The Present Indefinite Tense   
That paradoxical state of affairs is keeping traders guessing and prices volatile-  The Present Continuous Tense,   
Price gyrations  helped to banish the increasingly popular view that this year's oil shock was over, even if the Gulf menace was not. Which was line, because such complacency dangerous.  The Past Indefinite Tense,  
The chart was showing that, in any normal year, the time waas coming to draw down the stocks which were being built up over the spring and summer - The Past ContinuousTense,  
Which will be fine, because such complacency will be dangerous -поставить в The Future Indefinite Tense,  
OPEC will be producing almost as much oil as it does before the embargo is enforced. Meanwhile, demand will be falling faster than expected - The Future Continuous Tense Active

We used to live in London years ago.

I didn't like London but I have already got used to living in London now.

Would you go cycling when you were five?

Tourists would not come here years ago.

I am used to hearing about the fantastic things he does. That's no suprise.

I have benn living in China for years. At first I didn't like the food but now i have already got used to eating their strange delicacies.

Years ago we used to see her a lot because she liven near us.

I am used to wearing glasses now but it took me a long time because i found it very uncomfortable.

When I was young, i used to visit my grandmother every summer.

While studying at the university, I used to go swimming twice a week.