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13. What is the difference in the indication of a posterior event by a common form or a continuous form?

The common form, as a rule, will indicate that this is one of habitual actions which is sure to take place in future, and the continuous form will indicate that something is expected to take place or has been preplanned for this particular occasion. That is why the common form is preferable when you speak about the arrival of planes, trains, ships, etc., which operate on a regular schedule. The continuous form is to be used when speaking about people.

The train comes at seven.

My friend is coming at seven.

Both the future continuous and the future common form may be used to denote a single action in future. But the event is presented differently. The continuous form will indicate that you expect the event to begin and to be in progress in future, but you do not know -whether the event will be really completed or not. The common form will indicate that the action will be completed in future.

I shall be seeing you (waiting for you, talking with him) at five. (I want, I expect to see, wait, talk at five. I hope that this action will take place, I shall try to do it, but I can't be absolutely sure that I shall succeed.)

I shall see him at five. (I am quite sure that I shall see him then.)

14. When is a perfect form not used?

Note 1: The use of the perfect form very much depends on the structure of the sentence in which the form is used.

  • No perfect form is used to denote an event which has been in progress for some time before another event if these events are denoted by homogeneous predicates and not by predicates used in different clauses. Compare:

He walked about the city for some time and returned to his hotel, but:

He had walked about the city for some time when he decided to return, or:

When he had walked about the city for two hours he decided to return.

  • No perfect form is generally used in a clause of time introduced by the conjunctions "after", "before", "till", "until", "as soon as", unless you want to stress the priority of the event denoted by the form in the subordinate clause to the event denoted by the form in the principal clause.

Compare:

After he walked about the city for two hours he decided to return to his hotel.

После того как он побродил по городу два часа (Побродив по городу два часа), он решил вернуться в гостиницу.

Не did not return to his hotel before (until) he walked about the city for two hours.

Он вернулся, побродив по городу два часа.

But:

After he had walked about the city for two hours he decided to return. – Только после того, как он побродил по городу два часа, он решил вернуться.

He did not return before he had walked about the city for two hours. – Он не вернулся, пока не побродил по городу два часа.

  • No perfect form will be generally used in an object clause if the time of the action expressed by the verb form in this clause is exactly indicated by a date or a clause of time.

He said that he met them in 1974.

He said that he met them when he was on a holiday.

But:

He said that he had met them.

He said that he had met them in his early days.