1.You don't have to be acting to be clever.
2.You don't have to be acting clever.
I wonder whether they're the same thing in meaning and both are grammatically correct.
I think 2 is the short form of 1 and they're all grammatical.
Am I right?
You don't have to be acting to be clever. It's ok grammatically, but it does not make much sense. You don't have to be acting clever ly.
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fire11.You don't have to be acting to be clever.
It's ok grammatically, but it does not make much sense.
fire12.You don't have to be acting cleverly.
The adverb form is required. The meaning is different than the previous sentence, and it is a little bit more sensible.