I am not sure about a headache that will "come and go". However, there is post concussion syndrom(PCS) in which headache and dizziness can start within the first 7-10 days and last as long as 3 months. A good way to tell the difference in headache is to press below the eyes over the sinuses. If there is pain in that region, it is likely sinus headache. If this were my son, I would give him a full day of rest like you did. Then I would let him start to engage in some physical activities for 10 minutes or so, which at 11 years old, I am sure he has already. If he has no dizziness or confusion, and has no headache (other than sinus), I would allow him to participate in the track activities that you described. Now that he has had a concussion, it will be easier for him to get a concussion in the future.
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sure as in "a sure thing" or "Are you sure?" or "Yes, I'm sure"
I am "quite sure" that "pretty sure" means "almost sure".
Sure it is. As an adverb, sure is a synonym for yes, certainly, definitely, etc. Sure is an affirmative response to a question. Sure is also used as an adjective, such as 'sure footed' or 'a sure victory'.
'To be sure' is a verb 'am sure' is the 'I' part
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Sure.
It sure does.
The difference is that we do not say "I am for sure." The valley-girl adverb "for sure" means "certainly."
Yes.
sure sure sure
More sure, most sure