For, during & while

از ساختار for بعلاوه یک مدت زمانی خاص برای بیان این که یک کار چه مدت به درازا می انجامد استفاده می کنیم، برای مثال:

for two hours, for a week, for ages:

We watched TV for two hours last night.

Diane is going away for a week in September.

Where have you been? I"ve been waiting for ages.

Are you going away for the weekend?

از ساختار during بعلاوه اسم برای بیان این که چه زمانی اتفاق خاصی خواهد افتاد (و نه این که چه مدت به طول می انجامد) استفاده می کنیم:

during the film, during our holiday, during the night:

I fell asleep during the film.

We met some really nice people during our holiday.

The ground is wet; it must have rained during the night.

نکته: همراه با قیود زمان روزانه (نظیر: afternoon) می توان از دو عبارت in یا during استفاده نمود:

It must have rained in the night (or during the night).

I"ll phone you sometime during the afternoon (or in the afternoon).

جمله زیر به طور واضح تفاوت بین during و for را مشخص میکند:

I fell asleep during the film. I was asleep for half an hour.

بعد از while معمولا از فاعل بعلاوه فعل استفاده میشود:

We saw Clare while we were waiting for the bus.

While you were out, there was a phone call for you.

Chris read a book while I watched TV.

با توجه به جملات زیر به تفاوت کاربردی بین during و while می توان به خوبی پی برد:

I fell asleep during the film.

but

I fell asleep while I was watching TV.

We met a lot of interesting people during the holiday.

but

We met a lot of interesting people while we were on holida