Both sound strange; I would use: He is sick as well, or, of you needed to use I in the sentence, He is sick as well as I or he and I are both sick.
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Huzaifa AsifHe as well as I am sickHe as well as I is sick? Which of them is grammatically correct and why?It needs recasting, Huzaifa. 'As well as' is a subordinating conjunction, so the grammatical subject is 'He' and the concordant verb is therefore 'is'. However. the proximity of 'I' to the verb causes notional and proximal concord to be very strong, and
Aspara GusHmm, I didn’t think it sounded that bad.Heck, no—we all say it! It's just that Huzaifa is looking for the grammar.