Which one is correct?
"this is why" or "this is the reason why"?

Question

Which one is correct?
"this is why" or "this is the reason why"?

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It is used to provide an explanation or justification for something that has been stated or will be stated.

Examples:

I couldn't sleep last night, and this is why I'm so tired today.
She didn't attend the meeting, and this is why she missed important information.
He failed the exam, and this is why he needs to study harder.
This is why we need to take action now.
This is why I believe in you.

Alternatives:

that's why
hence
therefore
for this reason
as a result

It is used to explain a cause or reason in a more elaborate or formal manner.

Examples:

This is the reason why I couldn't make it to the party.
She explained the situation, and this is the reason why she was late.
This is the reason why we need to change our approach.
This is the reason why I chose this path.
This is the reason why we must act quickly.

Alternatives:

this is why
that's why
hence
therefore
for this reason

Both "this is why" and "this is the reason why" are correct and commonly used in English. They are interchangeable and serve the same purpose of explaining a cause or justification.

Last Updated: March 22, 2024