Once vs. As Soon As

What Is Their Main Difference?

The main difference between 'once' and 'as soon as' is that 'once' is more common than 'as soon as.'

Similarities and Differences

Parts of Speech

'Once' and 'as soon as' are conjunctions. They are classified as subordinating conjunctions of time. Have a look:

Example

Take the candies and run once he turns.

Take the candies and run as soon as he turns.

Meaning

'Once' as a conjunction means 'as soon as.' We can use these two conjunctions interchangeably to express that immediately after an action, another action or event follows. Watch:

Example

We went home as soon as the bell rang.

We went home once the bell rang.

Warning

'Once' can also be used as an adverb. As an adverb, it means 'one single time.' You cannot replace 'once' as an adverb with 'as soon as' because the meaning would be lost.

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What Is Their Main Difference?
- Parts of Speech
- Meaning

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