They left at nine, so they ought to (should) have arrived by now.
The author is a well-known expert, so his book ought to be (should be) reliable.
That should (ought to) please you (is likely to please you, will probably please you).
Bend Or is the horse that ought to win the race.
§ 116д.
Когда речь идет о вероятном событии или действии, причем подлежащим является безличное местоимение it или неодушевленное существительное, употребляетсяThis table is going to collapse one of these days; the legs are very weak.
Сравните:
The table will collapse if you stand on it.
(В данном предложении употребление будущего времени вызвано условным придаточным предложением.)
Be careful! The ice is going to crack!
Сравните:
The ice will melt if the sun comes out.
Сравните:
This ice is going to melt when the sun comes out.
(В этом предложении речь идет о том, что говорящий считает вероятным; необходимого условия еще нет.)
You’d better take an umbrella. It’s going to rain before evening.
(Говорящий считает, что дождь, вероятно, пойдет.)
Сравните:
There will be rain in the London area during the night.
(Официальная сводка погоды.)
Сравните:
The sun’s going to come out soon.
(Говорящий чувствует, что так будет, возможно, потому что облака уже расходятся.)
Сравните:
The sun will rise at 6.35. tomorrow morning.
(Простое будущее, речь идет о несомненном факте.)
Is this shortage of houses going to continue?
The work is going to be more difficult than I expected.
§ 116е.
Сочетание going to с инфинитивом употребляется и тогда, когда подлежащим является человек. Сравните:I’m going to have a cup of tea.
I think I’m going to have flu.
We’re going to enjoy our day by the sea; the weather forecast says it will be warm and sunny.
I haven’t worked very hard this term. I’m afraid I’m not going to pass the examination.
Tom’s going to find himself in trouble one of these days.
§ 116ж.
Для выражения вероятности или предположения употребляется также глагол will (would).This will be the book you’re looking for. (This is probably, this is likely to be, the book you’re looking for.)
That will be the postman, I expect.
You will have heard the news. (You have probably heard the news.)
She won’t have heard the news. (It is unlikely that she has heard the news.)
That happened a long time ago. I would be (was probably) about twenty at the time.