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Do the verbs 'think' and 'know' both take finite subordinate clauses as complements? I really don't know how to tell if it takes a finite or non-finite subordinate clause as complement. Can someone please help? Thank you!
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Nothing to do but try it:

I think/know (that) he is travelling in Spain now. --(finite OK!)

I think/know (that) travelling in Spain now. -- NO

I think/know (that) (to) travel in Spain now. -- NO
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Do the verbs 'think' and 'know' both take finite subordinate clauses as complements? I really don't know how to tell if it takes a finite or non-finite subordinate clause as complement. Can someone please help? Thank you!

I thought it best to call first. (non-finite)

I thought it was best to call first. (finite)

The authorities know him to be a cocaine dealer. (non-finite)

The authorities know that he is a cocaine dealer. (finite)