I’m sticking with one single issue today because I don’t want to overwhelm you. I have borrowed this explanation from another website. I hope it helps! I’ve also included a couple of past links for you from Editor’s Corner on this topic.
4. Which and That (from Writer’s Digest)
The battle over whether to use which or that is one many people struggle to get right. It’s a popular grammar question and most folks want a quick rule of thumb so they can get it right.
Here it is:
If the sentence doesn’t need the clause that the word in question is connecting, use which. If it does, use that. (Pretty easy to remember, isn’t it?) Let me explain with a couple of examples.
Our office, which has two lunchrooms, is located in Cincinnati.
Our office that has two lunchrooms is located in Cincinnati.
These sentences are not the same. The first sentence tells us that you have just one office, and it’s located in Cincinnati. The clause “which has two lunchrooms” gives us additional information, but it doesn’t change the meaning of the sentence. Remove the clause and the location of our one office would still be clear: Our office is located in Cincinnati.
The second sentence suggests that we have multiple offices, but the office with two lunchrooms is located in Cincinnati. The phrase “that has two lunchrooms” is known as a restrictive clause because another part of the sentence (our office) depends on it. You can’t remove that clause without changing the meaning of the sentence.
Let’s look at another example:
The time machine, which looked like a telephone booth, concerned Bill and Ted.
The time machine that looked like a telephone booth concerned Bill and Ted.
In the first sentence (thanks to the use of which), the time machine concerned Bill and Ted. It also happened to look like a telephone booth. In the second sentence (which uses the restrictive clause), Bill and Ted are concerned with the time machine that looks like a telephone booth. They aren’t concerned with the one that looks like a garden shed or the one that looks like a DeLorean (Marty McFly may have reservations about that one).
· https://episystechpubs.com/2015/03/31/editors-corner-which-witch-is-which/
· https://episystechpubs.com/2015/04/01/editors-corner-whiches-and-whats/
· https://episystechpubs.com/2014/02/13/editors-corner-commas-clauses-and-nonessential-elements/
· https://episystechpubs.com/2015/09/15/editors-corner-dependent-vs-independent-clauses/
Kara Church
Technical Editor, Advisory
619-542-6773 | Ext: 766773
Symitar Documentation Services
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