Отклонения от правила согласования времен

Случаи отклонения от правила согласования времен:

n в определительных придаточных предложениях, а также придаточных причинных и сравнительных предложениях глагол может употребляться во временах Present и Future:

My brother told me about the book which you are reading. He was not able to translate the article because he does not know English well enough. He refused to go to the theatre as he will have an examination in Economy in a few days. It was not so cold yesterday as it is today.

n глаголы must (в случае выражения приказания или совета), should и ought употребляются в придаточном предложении независимо от того, в каком времени стоит глагол главного предложения:

Не tells (told) us that we mustn't cross the road against the red light. He says (said) that I ought to send her a telegram at once. I tell (told) him that he should consult a doctor.

n форма Present сослагательного наклонения употребляется независимо от того, в каком времени стоит глагол главного предложения:

It is (was) necessary that he send us the documents.

n глагол в дополнительном придаточном предложении выражает общеизвестный факт:

Galileo proved that the earth moves (moved) round the sun.

--в научной и технической литературе после глаголов типа to believe, to assume, to suggest, to express, to maintain, и т.д., которые по своему значению не констатируют общеизвестную истину, а указывают на предположительные факты:

The author suggested that the main valency chains oflignin are built up by a repeating 2-ring system.

Упр.3 Поставьте глаголы в скобках в нужном по контексту времени.

a. They held that this observation _____ (show) the reaction to be intermolecular.

b. Kelner discovered that visible light __ (have) the remarkable ability of

restoring viability.

c. It was noticed that some water ____ (distill) at the beginning of the distillation.

d. It was supposed that hydrate formation ___ (play) a part in the aqueous polymerization.

e. He was modeling the simplest possible chemical reaction - hydrogen exchange, in which a hydrogen atom ____ (slam) into a hydrogen molecule and _____ (replace) one of its two atoms.