"I'm sure" is a phrase which is often translated as "estoy seguro", and "sure" is an adjective which is often translated as "seguro". Learn more about the difference between "I'm sure" and "sure" below.
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An adjective is a word that describes a noun (e.g. the big dog).
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).