What is the function of the engine?

An engine is a vehicle's main source of power. An engine produces mechanical power out of fuel by burning it. The created pressure is then used to drive a mechanical device. An engine is usually used in cars, planes, boats and more. 
Also, and engine depends on what kind of fuel we use. Currently, the most popular is gasoline but diesel is used. What's the difference? Well, diesel contains more heat energy than gasoline, making it more economical but it is thicker, heavier, and does not vaporize as easily as gasoline.

1 . They want (to be taken) to the concert by their father.
2 . I am glad (to have done) all the homework yesterday.
3 . This plant is known (to produce) tractors.
4 . He wants his son (to become) a lawyer.
5 . The enemy army was reported (to have overthrown) the defense lines and ( advanced) towards the suburbs of the city.
6 . He seems (to know) French very well: he is said (to have spent) his youth in Paris.
7 . You had better ( call) our distributors at once.
8 . We are happy (to have been invited) to the party.
9 . That firm is reported (to be conducting) negotiations for the purchase of sugar.
10 . It seemed (to have been snowing) heavily since early morning: the ground was covered with a deep layer of snow.
11 . He didn’t hear me ( knock) at the door.
12 . I want (to be informed) of her arrival.
13 . Our sportsmen are proud (to have won) the cup.
14 . He is known (to have been working) on the problem for many years.
15 . The representative of the firm asked for the documents (to be sent) by air mail.

2. Use the appropriate form of the infinitive.

1. They want to be taken to the concert by their father.  

2 .I am glad to have done all the homework yesterday.  

3. This plant is known to produce tractors.  

4. He wants his son to become a lawyer.  

5. The enemy army was reported to have overthrown the defense lines and to be advancing towards the suburbs of the city.  

6. He seems to know French very well: he is said to have spent his youth in Paris.  

7. You had better call our distributors at once.  

8. We are happy to be invited to the party.  

9. That firm is reported to be conducting negotiations for the purchase of sugar.  

10. It seemed to have been snowing heavily since early morning: the ground was covered with a deep layer of snow.