Thread: "На" против "Для"

Originally Posted by Antonio1986

I think I did a mistake: За последних пять дней.

За последние пять дней is correct. However it would be пять последних дней. The first one describes this time span as a whole, and the second one implies every of the last 5 days separately.

Originally Posted by Antonio1986

5. He will be studying for 4 years = Он будет учится на четыре года.

Он будет учиться четыре года (в течение четырех лет). Compare: Он уехал на стажировку на четыре года. I think this construction only works with perfective verbs.

Originally Posted by iCake

Он хромал десять дней - He was limping for 10 days
Я думал пять минут - I was/have been thinking for 5 minutes
Я думаю 5 минут - I am/have been thinking for 5 minutes

Only imperfective verbs here