Here are the words where one can add the apostrophes proper way.
1. I would love to say Killer. I'd love to say Killer. [WOULD]
2. He had never tried. He'd never tried.[HAD]
3. Mr.Patel is from Puna. He's from Puna.[ IS VERB 'TO BE']
4. That is my friend. That's my friend.
5. Jigar has got the prize. He's got the prize.
6. There is a mistake. There's mistake.