As Long As vs. So Long As

'As long as' and 'so long as' are conjunctions that confuse learners. In this lesson, we will learn more about them.

"As Long As" vs. "So Long As" in the English grammar

What Is Their Main Difference?

The main difference between 'as long as' and 'so long as' is that 'so long as' is that 'so long as' is more informal that 'as long as.'

Meaning

'As long as' and 'so long as' express the meaning 'if.' They introduce conditions, possible results, and requirements.

You can borrow the car as long as you drive safely.

You can borrow the car so long as you drive safely.

Parts of Speech

'As long as' and 'so long as' are conjunctions. They are used to connect clauses.

You are allowed to go as long as you come back before midnight.

You are allowed to go so long as you come back before midnight.

Formality

'As long as' is more formal than 'so long as.' 'So long as' is mainly used in spoken English. In fact, 'so long as' has been used informally at first and was not considered grammatically incorrect but after being commonly used, it has been accepted in the English grammar.

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