She gave her a knowing smile.
'Knowing'is an adjective.
'Knowing'is a present participle.
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Grammar Test - Prepositions after Adjectives 
Grammar Test - about/of 
Grammar Test - Futures 
Grammar Test - Phrasal Verbs - Lock 
Grammar Test - Indirect speech 
Grammar Test - no/not 
Grammar Test - Gerund/Infinitive 
Grammar Test - Phrasal Verbs - Wait 
Grammar Test - that/what 
Grammar Test - Singular/Plural 
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