Intelligent is a synonym for smart so try using clever or devious. Both are synonyms for sly.
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For sure.
"She was certain that the answer was 4"
"She knew for sure that the answer was 4"
<span>In this sentence, the words "to sleep" are an D. infinitive phrase. This is because the words start with an infinitive to sleep, which takes the form of to + verb. It isn't an adjective, but a verb, so it cannot be a predicate adjective. It is a direct object, not an indirect one. It isn't a prepositional phrase, because it doesn't start with a preposition.</span>
