Practice Infinitive

Ex. 1. Use the Infinitives with or without the participle “to”.

1. I helped him (to find) his things. 2. He made me (to do) all the work again. 3. My neighbour let me (to borrow) his own car. 4. When I was a child I was made (to go) to the doctor whenever I felt ill. 5. I can’t (to think) what made him (to do) such a thing. 6. I felt the insect (to crawl up) my arm. 7. Let’s (to watch) the boys (to dive). 8. She heard him (to open) the door. 9. You’d better (to try) not (to think) about it. 10. I asked him if he was willing (to help) me (to do) the job. 11. Why not (to allow) her (to do) as she likes? 12. Why not (to let) her (to do) as she likes? 13. They were seen (to come) to the corner.

Ex. 2. Translate these sentences into Russian. Pay attention to the Infinitive.

1. To prevent the spreading of this destructive disease is our main task now. 2. To dissolve this substance is not an easy matter. 3. To know how a plant grows is very interesting. 4. To solve this problem is very important in order to get higher yields. 5. To observe in detail the intracellular structure of most microorganisms with the light microscope is very difficult. 6. To perform the reverse experiment, removing the thoracic gland, is more difficult. 7. To avoid excessive multiplication of families and genera is a matter of convenience. 8. The main purpose of this chapter is to consider anthocyanins. 9. To determine these two phenomena is to investigate thoroughly their underlying mechanism. 10. The ultimate aim of the investigations is to correlate the observed structural and functional changes. 11. The function of this hormone will be to stimulate the secretion of progesterone. 12. The purpose of the mammary gland is to provide nourishment for the newborn child. 13. The author has attempted to make the student feel that genetics is a growing science. 14. It is hard to get lichens grow under laboratory conditions. 15. Observations on dogs treated with testosterone propinate led us test this compound in man. 16. The chromosomes cause the offspring to resemble their parents. 17. His interest in optics led him to examine all sorts of objects with the compound microscope. 18. Diseases cause changes to occur in tissues. 19. These findings may help to account for the results. 20. Their mouth-parts have been modified to serve purposes other than taking food. 21. A protoplasmic tube emerges from each pollen grain and grows down the style toenter the ovary. 22. To complete the list of species actually found in this habitat the following must be mentioned. 23. To separate the agar from walls of the tube, it is necessary to place the tube for a second or two into warm water. 24. He was too tired to be asked any questions. 25. Most of the leaves in such trees are too shaded to carry out photosynthesis efficiently. 26. This farm crop is drought resistant enough to grow under arid conditions. 27. This new method is not accurate enough to give any definite results. 28. All parts of a plant must be developed well enough to function properly.

Ex. 3. Translate into Russian. Pay attention to the Infinitive Constructions.

1. Our scientists want this crop to mature earlier in northern districts. 2. We know the maximum temperature for germination of tomato to be higher than that required for other crops. 3. The microscope reveals milk to consist of droplets of butter fat dispersed in watery fluid. 4. We know phosphorus, nitrogen, potassium, calcium, magnesium, and sulphur to be the primary elements. 5. Diffusion shows molecules of any substance to be in motion. 6. Although bacteria do have visible chromosomes, no one has ever seen bacterial cells fuse. 7. We expect every student to know the difference between the roots of the two plants. 8. People are known to act guiltily when they are innocent. 9. Mr. Kent is believed to have survived the accident. 10. Who is supposed to be in charge of the expedition? 11. Young Roy was said to be very attractive to girls. 12. He wasn’t expected to inherit the family business. 13. The group was reported to have got in touch with some university professors. 14. Tom was considered to be the cleverest boy in his class. 15. The committee was thought to have made a thorough investigation.

Ex. 4. Translate the sentences into Russian. Pay attention to the construction "for+noun+lnfinitive”.