Should the aircraft be "that", "which" or "who" in this context?
We have a large number of aircraft who can now upgrade their propellers.
In this context -- that.
Why? We use "who" with people, or with things we wish to give people-like qualities -- my dog, for instance.
"Which" is used to introduce a non-restrictive relative clause. Here, the clause is "can now upgrade their propellers." A non-restrictive clause is one that can be omitted without changing the meaning of the basic sentence. You can't do that in this context, so the clause is said to be restrictive.
"That" is used to introduce a restrictive relative clause.
|link comment||answered Sep 26 '12 at 13:07 Jeff Pribyl Grammarly Fellow|
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