park sang joon I don't know that I think~ I don't know if I think ... I don't know whether I think ... 'that' is less used than 'if' in this turn of phrase.
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park sang joonI don't know that I think~I don't know if I think ...
park sang joonI don't know that I think that's worth while.Broken into info nuggets:
I don't know that (similar to: I don't know if or I'm not sure that)
I think
that's worth while. (that is worthwhile)
CalifJimI don't know if I think ...I don't know whether I think ...Back in high school I had a teacher who would scold students who used whether without or (or or not). She said that whether evaluates listed options but if allows unstated options.
CalifJimUse a corpus like COCA, or ...Thanks for the referrals. I'll have to check them out.
SoSaysSunnywhat is your position on the topic?"or not" is not necessary (if that's what you're asking).