Informal contractions are the short form of a word that and are used while speaking casually. Contractions are not slang but are similar to slang. They are a part of informal writings. Example: he's (he+is), gonna (going+to),etc.
Contractions in formal writings:
Use of contractions should be avoided in formal writings. Contractions are basically a combination of two words. Hence their use is inappropriate in formal writings.
Hence, contractions should only be used in informal writings and should be avoided in formal language.
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