Once vs. As Soon As

'Once' as a conjunction can be used interchangeably with 'as soon as.' In this lesson, we will learn more about them.

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:

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:

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.

Comments

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'once' and 'one time' mean the same thing. In this lesson, we will compare them to find out when to use them.

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'Although' and 'though' are conjunction that expresses the meaning 'in spite of.' In this lesson, we will learn their similarities and difference.

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'Although' and 'even though' are confused by learners due to their similar appearance. In this lesson, we will learn their similarities and differences.

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'Although' and 'despite' are used to convey contrast. In this lesson, we will learn their similarities and differences.

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