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И. П. Крылова, Е. М. Гордон -- Грамматика совре...doc
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§ 54. In certain types of subordinate clauses the tenses are

used relatively, i.e. the tense form does not refer the action to the

present, past or future but shows whether the action of the subor-

dinate clause is simultaneous with the action of the principal

clause, precedes it or follows it.

The choice of the tense form in the subordinate clause depends ion the tense form used in the principal clause. This structurally dependent use of tenses in certain types of clauses is known as the rules of the sequence of tenses.

§ 55. The relative use of tenses is mainly observed in subordi- nate object clauses.

l) After one of the past forms in the principal clause (includ- ng the Future-in-the-Past) we find past forms in the subordinate clause.

If the action of the object clause is simultaneous with that of the principal clause, the Past Indefinite or the Past Continuous is used in the object clause no matter which past form is found in the principal clause (the Past Indefinite, the Past Continuous, the Past Perfect, the Past Perfect Continuous, or the Future-in-the-Past).

e.g. Nobody knew what he meant. I thought you were joking. He had not realized how nervous she was. He would never know what she was thinking.

If the action of the object clause precedes that of the principal clause, the Past Perfect or the Past Perfect Continuous is used in the object clause no matter which past form is found in the princi- pal clause.

e.g. The people she met seemed to know where she had been, what

she had been doing.

He was finally telling them what he had been concealing. Soames looked at her. He had said that she had not changed; now he perceived that she had.

If the action of the object clause follows that of the principal clause, the Future-in-the-Past or one of the other means of ex-

pressing future actions viewed from the past is used in the object clause no matter which past tense-aspect form is found in the principal clause.

e.g. I had feared that my companion would talk too much, but it was soon plain that there was no such danger. I explained that I was going up to London. He thought of how wet they were going to get in the rain. She knew that George would be waiting for her.

2) The rules of the sequence of tenses are also observed in ob- ject clauses if one of the present forms is used in the principal clause.

If the action of the object clause is simultaneous with that of the principal clause we find either the Present Indefinite or the Present Continuous in it no matter which of the present forms is used in the principal clause.

e.g. Maurice doesn't know what he is doing. "I know just how they feel," said Sophia. I am beginning to think you're a fool. You've noticed, I daresay, that she travels a good deal. "Adeline has been telling me," he said, "that her father is willing to send her abroad."

If the action of the object clause precedes that of the principal clause we' find the Present Perfect, the Past Indefinite, the Present Perfect Continuous or the Past Continuous in it no matter which of the present forms is used in the principal clause.

e.g. I don't know whether any of you have met her. I don't see why he did it. I don't want her to see I've been crying.

I'm beginning to understand why your grandfather left you his house.

If the action of the object clause follows that of the principal clause we find one of the future forms or one of the other means of expressing futurity in it no matter which of the present forms is used in the principal clause.

e.g. I don't think he'll ever forgive me for asking these people to come here.

I expect she'll be ringing up again very shortly. I don't know how I'm going to do it.

I've just told everyone that I'm sending him to school this au- tumn.

She's hoping I shall be back by Monday week. They haven't even told me who my successor is going to be.

3) The rules of the sequence of tenses are observed in object clauses if one of the future forms or one of the means of express- ing future actions is used in the principal clause.

If the action in the object clause is simultaneous with that of the principal clause we find the Present Indefinite or the Present Continuous in it.

e.g. I am sure we shall find we have quite a lot to say to one another. Sir Walter will tell you that I'm not exaggerating.

If the action in the object clause precedes that of the principal clause we find the Present Perfect or the Past Indefinite in it.

e.g. Miss Sophia will be glad you've come.

They will ask you when you arrived in New York. I never liked the idea and I'm not going to say I did. Oh, come, you're not going to tell me that you've never been in love since you were in love with me.

If the action in the object clause follows that of the principal clause we find one of the future forms or one of the other means of expressing future actions in it.

e.g. I'll tell you what I'll do.

We'll let you know what we are going to do about it.

You are going to say that this will cost you a thousand pounds.

Note 1. Grammars usually say that the choice of the tense form in the subor- dinate clause is free after a present or a future tense form in the principal clause. This is not quite correct as only the above described forms can be used in this case, their choice being as strict and as regular as after a past tense form in the princi- pal clause.

It is true, the relative use of tense forms is not so obvious after a present tense form in the principal clause since the situation is viewed from the moment of speaking and at first sight the use of tense forms seems to depend only on the sense. However, if we compare the use of tenses in object clauses after a present, past and future tense form it becomes evident that their choice always depends on the tense form of the predicate verb in the principal clause.

Besides, after a future tense in the principal clause it is a present tense form that is used in the object clause to express simultaneousness, but not a future tense form which might be logically expected (see the examples above). It might also be expected that a present tense form would denote priority after a future tense form in the principal clause but actually it is the Present Perfect or the Past Indefinite that are used.

Note 2. The rules of the sequence of tenses are observed in all object clauses ir- respective of the conjunction or the conjunctive word by which the clause is intro- duced. The object clause may also be joined to the principal clause asyndetically (see the examples above).

Note 3. It should be noted that the rules of the sequence of tenses hold good in object clauses after a formal it used as the subject of the principal clause.

e.g. It pleased me to think that he was making progress. It appears that you know my name. It was remarkable that she seldom thought of Gerald. It was announced at the commencement of the congress that a special mission would leave to investigate the crisis.

§ 56. Object clauses are usually subordinated to the predicate of the principal clause. But they may also be subordinated to some other parts of the sentence, expressed by a verbal and occa- sionally by an adjective. In this case the finite form of the subor- dinate clause also depends on the form of the predicate verb in the principal clause.

e.g. He wanted them to see that he was not hostile.

Winslow was fond of saying that he had a large collection of pictures.

He finally went home, satisfied that he would have no trou- ble.

John had left in April perfectly ignorant of what he wanted to become.