Used to refer to a specific thing or person already mentioned or known
Examples:
That night Holmes and I took a train to Norbury.'Read it to me, that's the best way.She knew now that he meant to speak.
Synonyms:
Antonyms:
Which
/wɪtʃ/
Used to refer to a specific thing or person from a group; often introduces a clause
Examples:
With which laconic remark Newman turned round and hobbled away.Victoria recovered quickly, which was not easy.You'd give us the Market, which you did.
Synonyms:
Antonyms:
This word has no antonyms
Ways to tell them apart:
Which introduces non-restrictive clauses, often separated by commas, providing extra information that can be omitted without changing the main meaning of the sentence.
That introduces restrictive clauses, providing essential information about the noun it follows, and is not separated by commas.
Remember: if the sentence still makes sense after removing the clause, use which; if not, use that.
Use which when you want to add an interesting detail or additional description that isn't crucial to the main point.
Use that when the clause is defining or specifying something essential to the meaning of the sentence.