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Could one tell me which to use?

1 He's not as big a pain as his brother.

2 He's not as big a pain as to do that.

3 He's as big a pain as to do that.

4 He's such a pain that he'll do that.

I think

1 CORRECT

2 CORRECT

3 INCORRECT

4 CORRECT

Could someone confirm?

thanks
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1 He's not as big a pain as his brother.

2 He's not as big a pain as to do that.

3 He's as big a pain as to do that.

4 He's such a pain that he'll do that.

I think

1 CORRECT

2 CORRECT - No. INCORRECT.

3 INCORRECT

4 CORRECT

You need so. And an appropriate adjective would be better than the noun.

He's not so stupid as to do that.

Possibly, but not as good:

He's not so big a pain as to do that.

CJ
Comments  
anyone please?

Thanks
 CalifJim's reply was promoted to an answer.