I got a question. Let's say two people are talking about riding the rollercoaster:
Person1 says to person number two:
Let's ride the rollercoaster, it's quite fun!
Then, person2 says:
I'm afraid of rollercoasters.
Then person2 replies to person1:
Come on, it won't (do you any) harm you!
Do I have to have (do) before harm for it to sound natural or can I just say "it won't harm you"?