Using through
Through can be used as a preposition or an adverb. When through is used as a preposition, it
is followed by a noun. When it is used as an adverb, it is not followed by a noun.
Through means from end to end or side to side of.
The River Thames goes through London.
We drove through the desert.
Through can also be used to talk about entering at one side and coming out at the other.
The road goes through the forest.
The train went through the tunnel.
She wouldn’t let me through.
To go through something is to examine it.
We must go through the accounts. (= We must examine the accounts.)
Through can also be used to talk about time. It means from beginning to end of.
He will not live through the night. (= He will die before morning.)
Through as an adverb
As an adverb through means from end to end, side to side or beginning to end.
I have read the letter through twice and cannot understand it.
Through can mean ‘all the way’.
Does this train go through to Bangkok? (= Does this train go all the way to Bangkok?)
All through
I was awake all through the night.
Through can also indicate the cause, etc.
The accident happened through no fault of yours.