Can I say, for example:
I hate math since I was in primary school!
or
I hated math since I was in primary school!
Can I use "since" with the present simple tense?
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Sign up to join this communityI hate math since I was in primary school!
means that being in primary school caused you to hate math. It is the same as saying, "I hate math because I was in primary school."
To say that you started hating math in primary school and still hate it, you would say,
I have hated math ever since I was in primary school.
I hated math since I was in primary school!
has become common usage and few would blink twice at hearing it. Some would shudder, though, and all should.
A native speaker isn't likely to say either of those - you'd expect to see either
I've hated math since primary school!
or
I've hated math ever since I was in primary school!
or even
I've hated math since I was in primary school
Without the "have" (in "I've") or the "ever" in the second example as the other answer states, the "since" is taking on it's definition of "because" rather than "from this time" - "I hated X since Y" could imply Y is the cause of hating X.