First, let’s define “that” and “which.” “That” is a restrictive pronoun, meaning it limits the scope or range of the noun it modifies. For example, “The book that is on the table” specifies which book we’re talking about- the one on the table. On the other hand, “which” is a non-restrictive pronoun, adding additional information or description to a sentence in a non-essential way. For example, “The book, which is on the table, is my favorite.” The information about the book being on the table is not necessary for the reader to understand the sentence’s main point- that it’s the speaker’s favorite book.
Now that we have a baseline, let’s explore some tips on how to correctly use “that” and “which” in your writing or speech.
1. Determine if the clause is necessary for the sentence’s meaning.
When deciding whether to use “that” or “which,” consider if the information provided in the clause is essential for the reader’s understanding of the sentence. If the clause is necessary, use “that.” If the information is optional or adds clarity but doesn’t fundamentally change the meaning, use “which.” Remember, “that” is restrictive, while “which” is non-restrictive.
2. Use commas to separate non-restrictive clauses.
If you’ve decided to use “which” in your sentence, you must offset the non-restrictive clause with commas. The commas signal that the information contained within the clause is supplementary, like an afterthought or elaboration, not essential for interpretation. For example, “The cake, which was baked from scratch, was absolutely delicious.” The clause “which was baked from scratch” provides additional information but does not fundamentally alter the sentence’s main point- that the cake was delicious.
3. Avoid ambiguity.
Using the incorrect pronoun or omitting necessary punctuation can lead to ambiguity in your writing or speech, and confusion for your reader or listener. For example, “The cookies that have chocolate chips are delicious” and “The cookies, that have chocolate chips, are delicious” mean two different things! The former is restrictive, indicating that only certain cookies (the ones with chocolate chips) are delicious. The latter is non-restrictive, indicating that all the cookies are delicious, and the fact that some have chocolate chips is an added detail.
4. Use “that” with clauses that specify a particular noun.
If the clause specifically identifies a particular noun, use “that.” For example, “I’m looking for the book that I left on the table.” The clause “that I left on the table” identifies which book the speaker is looking for, making “that” the appropriate pronoun choice.
5. Use “which” with clauses that provide additional, non-essential information.
If the clause adds extra information that isn’t essential to the sentence’s meaning, use “which.” For example, “My sister, who is a doctor, is coming to visit.” The fact that the speaker’s sister is a doctor is supplementary and not necessary for the reader to understand the sentence’s main point – that she’s coming to visit.
By following these tips, you can correctly use “that” and “which” in your writing and speech and avoid ambiguity or confusion. Remember, “that” is restrictive, while “which” is non-restrictive, and using commas to separate non-restrictive clauses is crucial for clarity. So take some time to practice, and soon you’ll be a pro at using “that” and “which” correctly and effectively.