As Long As vs. While
What Is Their Main Difference?
The main difference 'as long as' and 'while' is that 'as long as' expresses shorter periods of time than 'while.'
Meaning
'As long as' and 'while' can be used to express time. However, there is a small distinction that requires your attention. 'As long as' compares two situations that occur in similar duration. 'While' expresses two long actions or situations that happen at the same time.
I took a nap while he watched a movie.
She cleaned the house while we were out.
Parts of Speech
'While' is a conjunctive adverb. It is used to connect clauses. Have a look:
We helped with the lights while Louis prepared the camera.
I grabbed a few towels while she took care of the broken glass.
'While' can also be used as a noun. In this case, we cannot use 'while' alone and it is often used to indicate time. It is often accompanied by 'in a...,' 'once in a...,' 'for a...,' 'a...,' and 'worth your...'.
I will keep them busy for a while.
The update might take a while.
He came back to me after a while.
'As long as' can be used as a preposition and an adverb.
You can stay here as long as you want.
His shower was as long as a football match.
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