As vs. Since

'As' and 'since' are conjunctions of cause and effect. In this lesson, we will learn their similarities and differences.

What Is Their Main Difference?

The main difference between 'as' and 'since' is in their formality. 'Since' is more formal than 'as.'

Similarities and Differences

Talking about Result

We use 'as' and 'since' to talk about the results of an action or event. In other words, when we use them, we are emphasizing the result and not the reason.

He wanted to visit Easter Island as he was in Chile anyway.

He wanted to visit Easter Island since he was in Chile anyway.

As you can see in the examples above, 'as' and 'since' are interchangeable.

Parts of Speech

'As' and 'since' are conjunctions. They are used to link clauses because they are subordinating conjunctions.

I skipped class, as I haven't done my homework.

I skipped class, since I haven't done my homework.

Punctuation

If we are using 'as' and 'since' at the beginning of the sentence, the 'as-' or 'since-' clause gets a comma at the end. Have a look:

As we were done with work, we grabbed coffee.

Since we were done with work, we grabbed coffee.

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