1. in front of the building was gathered a lot of people. 이 도치문장을..
in front of the building were a lot of people gathered. 이렇게 도치할순 없나요???

2. of great significance to all motor vehicle users is keeping the traffic laws.
여기서 of great significance~ 는 전치사구이고 보어 역할을 하는것이 맞죠? 여기서 of 가 어떤 역할을하는지 궁금해요.