⇒
1. A train leaves at 8 o'clock every morning
→ There is a train which leaves at 8 o'clock every morning.
2. Nobody can deny that she has a beautiful voice
→ It can't be denied that she has the beautiful voice.
3. I would like you to help me to put the chairs away (MIND)
→ Do you mind helping me put the chairs away?
4. He would prefer you to pay him immediately (RATHER)
→ He’d rather you paid him immediately.