1.She is the only one of the girls that speaks french
이 문장에서 선행사가 the only- 인지 she 인지 모르겠어요..

2. But when a robot scans a room, it sees nothing but a vast collection of straight and curved lines, which it converts to pixel
선행사가 a vase collection 인가요??
,which 가문장에서 but it 으로 쓰일수있나요??

3.This causes an irregular arrival of the lighta waves,which gives the viewer an impression of twinkling.
문장에서,which = but it 되나요???

답변부탁드려요ㅠㅠ!!