all that / that

Mnemon

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Joined
Sep 22, 2021
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Interested in Language
Native Language
Persian
Home Country
Iran
Current Location
Iran
a. He's not that clever.

b. He's not all that clever.

What's the difference?
 
The word that in sentence a. could be emphatic—referring comparatively to what has just been said. (He's not as clever as that.) Sentence b. can't do that.

Equally, both that and all that could also be degree modifiers, similar to 'very'. (He's not very clever.)
 
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