1. My sister won't open the door if she doesn't know who is it.
-> Unless my sister knows who is it, she won't open the door. ( unless = if... not )
2. The film was long and boring so we turned off the TV and went to bed.
-> It was such a long and boring film that we turned off the TV and went to bed.
- S + tobe + so + adj + that + S + V = S + tobe + such + adj + N + that + S + V