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Can "would" be used at the end of a word?

Eg: she'd
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What you mean to ask is whether "would" can be used as part of a contraction. Yes, it can, in some cases. You can use it with personal pronouns (e.g. I'd, she'd, we'd, etc.); but you cannot use it with just any noun. Furthermore, contractions are only used informally; use them in speech, or in a casual email to a friend, but do not use them for any sort of business correspondence or formal essay or anything like that.