difference between "That is why" and "which is why"

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pritychhetri

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What is the difference between "that is why" and "which is why"?

When to use that is why and when to use which is why?
 

chester_100

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What is the difference between "that is why" and "which is why"?

When to use that is why and when to use which is why?


-I couldn't pass the course, which is why I have to take it again.

In such sentences, which directly refers to the sentence preceding it, and we should put a comma before it.
We can't start a new sentence by which.


-I couldn't pass the course. That is why I have to take it again.
In this one, that, even though it is semantically related to the sentence before it, canstart a new sentence and isn't structurally dependent on the preceding sentence.


I don't find it necessary to get into more detail.
 

Rover_KE

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That's an excellent answer, Chester.

Rover
 

pritychhetri

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Thanks a ton for the answer!!

I was basically talking about speaking English.

As per your answer, I see that meaning point of view there is no difference, but in the writing it makes a difference.

Like putting the comma in case of which.

So, I guess, I need to make sure that while speaking it is always better to use that is why.

what do you say?
 

Rover_KE

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It's probably more likely to be used that way, but 'which is why' is also possible.

Rover
 
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