Hi there, I'd be glad to answer your question. In regards with this, Formal English follows rules of grammar very strictly. Sentences tend to be longer and more complex. It tends to be used in professional and business situations. It is also better organized and thought out.

Informal English on the other hand is generally used with friends and family. A number of grammar expressions have common forms which differ in their formal or informal use. These differences are noted both in written and spoken English. However, they are most notable in written English.

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