Question

I haven’t written to him for 3 weeks.

= The last time………………………………………………………………
It’s months since we decorated this room
=We haven’t…………………………………………...................….
I didn’t know how to swim until I was 17 years old.
=Not until..................................................................................

Answer 1

1. I wrote to him was 3 weeks ago.

2. decorated this room for months.

3. Not until I was 17 years old did I know how to swim.