As Long As vs. As Far As 

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

What Is Their Main Difference?

The main difference between 'as long as' and 'as far as' is that they express different meanings. 'As long as' expresses a period of time while 'as far as' talks about extent.

Usage

'As long as' and 'as far as' are used in different situations:

As long as

'As long as' is used to mean 'if.' We use it to express conditions.

Example

As long as you study hard, you will pass the exam.

'As long as' is used to express a certain period of time.

Example

You can stay here as long as you want.

We can also use 'as long as' to show requirements.

Example

You can stay here as long as you pay more.

We also use 'as long as' to compare length.

Example

My left leg is as long as my right leg.

As far as

'As far as' refers to the extent of something (knowledge and understanding).

Example

As far as I am aware, there is no issues.

'As far as' can also be used to show distance and degree.

Example

There were flowers as far as I could see.

Parts of Speech

'As long as' and 'as far as' are both conjunctions. They are classified as subordinating conjunctions. They are used to join clauses.

Example

As long as you are good at grammar, you would be alright.

This is the best show as far as I know.

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