[Grammar] How can you determine that if a person is optimistic or pesemistic ?

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sania-baharat

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Hello,
Are these sentences wrong?

How can you determine that if a person is optimistic or pesemistic ?
How do you know that whether she tells truth or not?

I don't know when we should use "that". Could you please help me? Can we use "that" with "if" and all "wh-words"?
 

Matthew Wai

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I think we can't use 'that' before those words.
 

Rover_KE

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[STRIKE]pesemistic[/STRIKE] pessimistic
 
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