How do you use "tho"?
I wanna know the usage of "tho" clearly.

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I would not advocate using this spelling of 'though.' I am a native speaker and have never used it. Not once.

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If I am not mistaken it is just text lang for "though" placed at the end of a sentence.

For example;

"How do you like your pasta"?

"Its alright but dat garlic bread tho"

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Tho is an informal way of saying 'though' The meaning is exactly the same, so it is used as a conjunction or adverb:

I got the job even though (tho) I failed the test.
I enjoyed the movie, I'm not going again tomorrow, though (tho)