Question

She was seen to enter the room

Answer 1

Explanation:

She was seen entering the room.

Answer 2

Question : She was seen to enter the room. (Change the voice)

Answer :

We saw her to enter the room.

If we use Gerund to rewrite both the sentences of Active Voice and Passive Voice, we will get the sentences as follows :

1. She was seen entering the room.

2. We saw her entering the room.