p143

p.143

How long…’

DURING IS ALWAYS USED IN AN ANSWER TO When did that happen?

He phoned during our dinner

He died during the war

FOR IS ESPECIALLY USED WITH THE PRESENT PERFECT

I’ve studied for 2 hours(I’ve studied during 2 hours)

SINCE – STARTING POINT

ESPECIALLY USED WITH PREST.PERFECT

I’ve studied since I was a child

I’ve studied since 1986

Unti-/till – expressions of time – hasta