Need advice on some grammar questions, Thx teachers

[Help Wanted]

Hello teachers,

Sorry for keep posting more queries here but I really do need your valuable advice on some questions below. A billion thanks for advising.

1. Can I use "be" in the following sentence?
e.g. If you eat too much, you will be sick/fatter

2. Is the following sentence grammatically correct?
e.g. If I don't use the zebra-crossing, the cars won't stop.

3. If I study hard, I will have a good result OR I will have a high mark in my test. ( sth wrong???)

4. If my brother goes to bed late tonight, he will be tired next morning. (Is this sentence grammatically correct?)

Many, many thanks for helping Help Wanted

[Red5]

1. Can I use "be" in the following sentence?
e.g. If you eat too much, you will be sick/fatter

be sick works, be fatter doesn't work

2. Is the following sentence grammatically correct?
e.g. If I don't use the zebra-crossing, the cars won't stop.

I think it's fine as it is.

3. If I study hard, I will have a good result OR I will have a high mark in my test. ( sth wrong???)

I would use GET instead of HAVE in both examples.

4. If my brother goes to bed late tonight, he will be tired next morning. (Is this sentence grammatically correct?)

Thak looks fine to me.

[Help Wanted]

Thank you sooooo much for advising, teacher Red5!