I'm going to ride a bike.

1. Okay, but you should wear a healmet.
2. Okay, but you ought to wear a healmet.
3. Okay, but you must wear a healmet.
4. Okay, but you have to wear a healmet.
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#1 is a suitable answer to the statement, I think. If we use other expressions, what difference do we have?

5 answers

Correct the spelling of "helmet."

All are correct once the spelling is taken care of. You could also write ... you need to ...
Thank you.

I'm going to ride a bike.
1. Okay, but you should wear a helmet.
2. Okay, but you ought to wear a helmet.
3. Okay, but you must wear a helmet.
4. Okay, but you have to wear a helmet.
Correct.
#1 and #2 are the same
#3 and #4 are the same, but stronger than 1 & 2.
Or you could say, you're nuts if you don't wear a helmet.