to or -ing?

My neighbour said that he would call the police. THREATENED My neighbour...

My neighbour threatened to call the police.

I think Derek has forgotten the meeting APPEARS Derek...

Derek appears to have forgotten the meeting.

Don't forget the lights when you leave. OFF Don't forget...

Don't forget to turn off the lights.

I could hear the sounds of a conversation from upstairs. SOMEONE I could hear...

I could hear someone speaking upstairs.

I was difficult for me not to laugh at Wendy´s letter. HELP I...

I couldn't help laughing at Wendy's letter.

I'm sorry , but you have not been appointed to the post. REGRET I..

I regret to inform you that you have not been appointed to the post.

I needed a drink of water so I stopped running. TO I topped running...

I stopped running to drink water.

I think it would be a great idea to take the train. TAKING I....the train.

I suggest taking the train

jack said that he hadn't cheated in the exam. CHEATING Jack...in the exam

Jack denied cheating in the exam.

Luckily Jane didn't have to pay a fine. PAYING Luckily Jane...

Luckily Jane avoided paying a fine.