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That's why Meaning in English

expression

ˈðæts/ /ˈhwaɪ/, /ˈwaɪ
THATS WHY or THATS HWY
ðæts/ /wˈaɪ
THATS WAI

Definition

Used to show the reason for something that was just mentioned.

Usage & Nuances

Commonly used to explain results or consequences. Usually comes before the action explained, e.g., 'That's why I'm late.' Can be sentence-initial or mid-sentence. Avoid in very formal writing; it's mainly spoken or informal written English.

Example Sentences

I forgot my keys. That's why I'm late.

basic

She's tired. That's why she wants to go home.

basic

The store is closed. That's why we can't buy bread.

basic

He didn't answer his phone, so that's why I came here.

natural

You look confused. That's why I'm explaining everything again.

natural

It's raining hard—that's why I brought an umbrella.

natural