Перевести а то у меня бред какой то получается(( the petrol engine must usually be set in motion before an explosion can take place and power can be developed; moreover, it cannot develop much power at low speeds. these difficulties have been overcome by the use of gears and clutches, which permit the engine to work at a speed higher than that of the wheels, and to work when the vehicle is at rest. an electric starter receiving its current from the storage battery, turns the crankshaft, thus starting the petrol engine. the starter motor is of a special type that operates under a heavy overload, producing high power for very short periods. in modern cars, the starter motor is automatically actuated when the ignition switch is turned on.
Ответы на вопрос:
Cambridge Dictionary
Поиск: грамматика
Present perfect continuous (I have been working)
Grammar > Verbs > Tenses and time > Present > Present perfect continuous (I have been working)
из English Grammar Today
Present perfect continuous: form
We use have/has + been + the -ing form of the verb.
+
she, he, it
I, you, we, they
has
have
been working.
−
she, he, it
I, you, we, they
(full form)
has not
have not
been working.
she, he, it
I, you, we, they
(short form)
hasn’t
haven’t
? +
Has
Have
she, he, it
I, you, we, they
been working?
? −
(full form)
Has
Have
she, he, it
I, you, we, they
not
been working?
(short form)
Hasn’t
Haven’t
she, he, it
I, you, we, they
Present perfect continuous: uses
Recent past activities
We use the present perfect continuous to talk about a finished activity in the recent past. Using the present perfect continuous focuses on the activity.
We don’t give a specific time. Even though the activity is finished, we can see the result in the present:
I’ve just been cleaning the car. (The car is wet and clean.)
It’s been snowing. (The ground is covered in snow.)
What have you been buying?
One continuing event
We use the present perfect continuous for a single activity that began at a point in the past and is still continuing:
I’ve been reading your book – it’s great. (I’m still reading it.)
He’s been living in the village since 1995. (He is still living in the village.)
She has been writing her autobiography since 1987.
Repeated continuing events
We use the present perfect continuous to talk about repeated activities which started at a particular time in the past and are still continuing up until now:
I’ve been going to Spain on holiday every year since 1987.
I haven’t been eating much lunch lately. I’ve been going to the gym at lunchtimes.
She’s been playing tennis on and off for three years.
How long …?
We often use the present perfect continuous to ask and answer questions about the duration of an activity. We use the question How long …+ present perfect continuous:
A:
How long have you been waiting for me?
B:
About ten minutes. Not too long. (I’ve been waiting for about ten minutes
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