The Difference Between That And Which

the grammar guru

It is a common misconception that “that” and “which” are completely interchangeable. Not so!

They are used to add information to a sentence and are known as relative pronouns.

But how do you know the correct one to use?

The rule is simple. In a defining (or restrictive) clause, use “that”. In non-defining (or non-restrictive) clauses, use “which”.

And what, you may ask, is a defining clause? It gives information essential to the meaning of the sentence.

For example: “Joe pointed to the foot that was hurt.” In this sentence, “that” introduces essential information about the noun that comes before it – the “foot”.

A non-defining clause introduces information that could be left out of the sentence without affecting the meaning.

For example: “Joe picked up his bag, which contained his packed lunch.” In this sentence, leaving out the clause about the packed lunch results in a sentence that contains less information but still makes sense.

A handy clue is that a non-defining clause is often preceded by a comma, suggesting that the information is supplementary, whereas a comma should not precede a defining clause, suggesting that the information is needed. Simple!

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Angela Gilchrist

Angela is Editor-in-Chief of “The People’s Friend” magazine. Her passions include cats, Highland ponies, good books, vegetarian food and long walks in the Scottish countryside. Her favourite place to get away from it all is the magical Isle of Skye.