Threw and through are homophones in English and can sometimes be confused; they are both pronounced / θruː/ but have different spellings and their meanings are completely different.
threw

Threw is the past tense of the verb ‘to throw’.
Joe threw the ball as hard as he could.
through

Through can be a preposition or an adverb.
To go through something means to move across it or from one side or end of it to the other.
Go straight through that door under the EXIT sign.
Cross into France, go through Andorra and into Spain.
He pushed his way through to the edge of the crowd where he waited.
He went straight through to the kitchen.
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