1. I am sure that she is intelligent to deal with the matter.
2. I am sure that she is intelligent because she deals with the matter.
3. I am sure that she is intelligent because she dealt with the matter.
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Does #1 mean #2 or #3? Or else?
What is the meaning of 'to deal with the matter' in Sentence 1?
#1 is bad English -- improper grammar
#2 is grammatical, but not something I'd say
#3 is best, because it offers an accomplishment as proof of intelligence.