- Threw and through are pronounced the same, but they have different meanings and uses.
- Threw is the past tense of the verb throw.
- It’s the word you use to say that something threw you for a loop or threw you off.
- Through is an adverb and a preposition.
- It’s used to say that you entered on one side of something and exited on the other.
Threw and through are homophones—words that have different meanings and spellings but are pronounced the same. Homophones are often a cause of confusion, even when they belong to completely different parts of speech, as do threw and through.
Difference Between Threw and Through
Threw is the past tense of the verb throw, which means to launch something into the air with your hand:
We use throw in many phrasal verbs. To throw something away means to get rid of it. To throw something in can mean to add something to an offer. To throw oneself into something means to start working on it with enthusiasm. Throw is also part of several common idioms, like when you say that something is a stone’s throw away, or that something threw you for a loop.
Through can be used as a preposition or an adverb. It’s used to indicate movement that leads into one side of something and out the other side:
Through has a few other uses, too. It can be used instead of the phrase “by means of”.
It can also refer to time.
Through and Threw in a Sentence
from Grammarly Blog https://www.grammarly.com/blog/threw-through/