How do you use tis in a sentence?

"Tis" is an archaic form of "it is". It is rarely used in modern English. Here are some examples:

* Formal/Literary: "Tis a tale told by an idiot, full of sound and fury, signifying nothing." (This is a famous line from Shakespeare's Macbeth.)

* Humorous/Archaic: "Tis a cold day for a walk, but I must brave the elements!" (This sounds a bit old-fashioned, almost like a character from a historical novel.)

It's generally best to avoid "tis" unless you're intentionally writing in an archaic or literary style.