Я не знаю - I don't know ))
How big is this fox? - Насколько велика эта лиса?
What size is it? - Какого она размера?
1. to study - после глагола promise идет инфинитив с to
2. stealing - после глагола deny идет герундий
3. stay - после глагола let идет инфинитив без to
4. doing - после after идет герундий
5. visiting после look forward to герундий
6.
2)
1. The room was filled with smoke.
2. The garage was painted with a new kind of paint.
3. These photos were taken by my sister.
4. These photos were taken with an old camera.