grammar · neutral
, which is why + S + V
A non-defining clause connector used to explain reason or result of the previous clause: clause, which is why + clause.
Examples
“The roads were icy, which is why many flights were delayed.”
“She studied all night, which is why she passed the exam.”
“The company expanded quickly, which is why profits rose.”
Band 8 sentence
“The survey returned a low response rate, which is why further research is necessary before drawing conclusions.”
Collocations
- clause + , which is why + clause
Common mistakes
The roads were icy that is why many flights were delayed.→The roads were icy, which is why many flights were delayed.
He failed the test which why he was upset.→He failed the test, which is why he was upset.
She came late, that is why she missed the introduction.→She came late, which is why she missed the introduction.
Say it for a higher band
5that is why + S + V→6which is why + S + V→7+, which is why + S + V
Synonyms
which explains why + S + V
Easily confused
which is why vs that is why vs why
“The experiment failed, which is why we repeated it.”
Related words
Learn this word with the rest of its set, and get reminded at the right time.
In Relative clauses
Learn it with its set