⇒

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.

1. There is a train which leaves at 8 o'clock every morning. 

2. It can’t be denied that she has a beautiful voice. 

3. Do you mind helping me to put the chair away.

4. He'd rather you paid him immediately.