Which or That
Which or That : Grammar and Spelling TipsWhat is the difference between which (or who) and that? How can you tell which one to use? The basic question is whether you or the person you are talking to already know what it is that you are talking about. In the sentence: • I've lost the book that I was reading yesterday. That introduces information that the listener needs in order to know what book is being talked about. You can also say: • I've lost the book which I was reading yesterday. In this sentence: • This book, which I bought yesterday, is very interesting. Which tells the listener something new about a book that has already been identified. You shouldn't use that in sentences of this kind. Tips Index
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