1. That’s what I am really concerned of.
Is this sentence grammatically correct?
Is there any case wherein concerned of can be used?
fold scarf 101 Is this sentence grammatically correct? No. fold scarf 101 Is there any case wherein concerned of can be used?
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fold scarf 101Is this sentence grammatically correct?
No.
fold scarf 101Is there any case wherein concerned of can be used?
Not the way you're thinking of it. The two words can appear next to each other, of course, in sentences like "We need to tell those concerned of the disaster."