det
which
wihch
det
1
Used to ask someone to specify one or more people or things from a known set.
"Which coat is yours, the black one or the grey one?"
"Which train goes to the airport?"
pron
1
Used to introduce extra information about something just mentioned.
"The house, which was built in 1890, has just been renovated."
"She passed the exam, which surprised everyone."
How to Use Which
Learner’s notesIn plain EnglishA word for picking out one option from a group, or for adding extra detail about something already named.
Common mistake
Use "which" for extra, non-essential information set off by commas; use "that" for information essential to identifying the noun ("the car that I bought" vs. "my car, which is red").
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Fill the Gap
Can you complete this real example?
_____ coat is yours, the black one or the grey one?
Etymology
From Old English hwelc, literally "of what kind" — built from the same root as "who" and "what".