Формы инфинитива

Tenses	Действительный залог Active Voice	Страдательный залог Passive Voice
Indefinite (Simple)	to ask спросить, спрашивать	to be asked быть спрошенным, быть спрашиваемым
Continuous	to be asking спрашивать	--------
Perfect	to have asked спросить, спрашивать	to have been asked быть спрошенным
Perfect Continuous	to have been asking спрашивать	--------

Инфинитив (The Infinitive)

Как структурный элемент сказуемого

Признак	Употребление	Примеры	Перевод
to V	1. Для образования Future Indefinite (Simple). 2. a) с модальными глаголами can (could), may (might), must, should, would; b) c эквивалентом модального глагола must – to be (согласно расписанию, договоренности); c) c эквивалентом модального глагола must – to have (приходится по обстоятельствам). d) с глаголами, характеризующими протекание действия: begin, continue, cease, start, etc. 3. После глагола связки to be.	X will V will do X can V can do X be to V am/is/are/was/were to do X have to V has/have/had to do X begin to V begins to do X task be to V is/was/were to do	будет делать/буду делать может делать должен/должны/ должен был/должны были делать должен/должны/ должны были делать начинает делать заключается/заклю-чалось в том, чтобы сделать

4. В каждом ряду найдите инфинитив являющийся частью сказуемого.

a) X will 1; X xs the x in order to 2, X begins to 3, X is to 4, X is the first to 5;

b) X is x enough to 6, X can 7, X is sufficient to 8, X shall 9, X must 10;

c) X is xed to 11, X would 12, X xs the x to 13, X starts to 14, X is the third to 15;

d) X may 16, To 17 is, X should 18, X has to 19, X xs the x so as to 20.

5. Выделите речевые отрезки, в которых инфинитив является частью сказуемого.

To invent is difficult; the circuits are to be invented; he was the first to invent; an attempt to invent was made; our task is to invent; the scientist is to invent; to invent the device you must; the physicists had to invent; the device to be invented is; the system may be invented; the engineer begins to invent.

6. Выделите предложения, в которых инфинитив является частью сказуемого.

1. The workers must employ this machine.

2. Automation is one of the ways to increase productivity.

3. The wire to connect the terminals is 10 meters long.

4. The function of a boiler is to transfer heat to the water in the most efficient manner.

5. The voltage is to be measured.

6. Thomas was the first to focus attention on this type of reaction.

7. The purpose of this test is to determine the mechanical characteristics of the material.

8. To construct an experiment of this kind seems nearly impossible.

9. The temperature begins to rise sharply.

10. He must have finished his experiment.