As an adjective, through means finished or done.
If you finished your homework you might shout "I'm through!"
As an adverb it can mean backward and forward, completely, up to and including, or all the way to the end.
You know you are busy when the only way you can talk to your brother is through WhatsApp, even though if you live in the same house.
Caffeine kept me up all night, so I need to drink more coffee to get through today... Right??
Got through security. Next is the 5 hour wait before flight .
You are a strong person, you can get through this.
The preposition through means in and out of.
He hit the nail through the wood.
She looked through the binoculars.
The bullet had gone through his hand.
He just walked through the door.
The security guards pushed their way through the crowd.
She could see a figure through the fog.
I looked through the window.
You walk through a door.
He is almost through with his studies.
I read this book through.
This bus goes through to New York.
Think this through very carefully!
She got soaked through in the rain.
I'm frozen through.
A letter shot through with the writer's personality.
We knew him through and through.
Those boards are rotten through and through.
This cylinder measures 15 inches through.
Breathe in and out smoothly and deeply through the nose for a few breaths.
Mary understood this all through her life and this was her style of living.
Those people who wouldn't be quiet and talked through the entire movie.
The first half of the alphabet are the letters A through M.
If you've memorized the multiplication table, you know the whole thing through.
After the treatment, the patient is through except for follow-up.
On this particular evening, grace presented itself through my wife’s inadvertent assistance.
When seen through this prism, the opportunities for life-altering innovation are limitless.
