Both are used in the closing line of (primarily) a request letter. The first is a bit more formal, less friendly, than the second. "We need a closing line in a business letter or email: to make a reference to a future event: I look forward to your reply.
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sonumlTeacher can you please teach me when to use suffixes like 'able, ible, ous, ive, ably, ness, ence, ance' and manyYou're right—too many to itemize here. Anyway, you and I do not 'use' them; we find them already attached to word roots that have been made nouns, verbs, adjectives or adverbs. You will learn them as a part of the new words that you gain.