Why

Synonyms of why

• cause
• reason
• purpose

Antonyms of why

• thus
• therefore
• because

Collocations of why

reason why

Frequency: 70 %

Can you explain the reason why you are late?

wonder why

Frequency: 60 %

I wonder why she didn't show up to the party.

know why

Frequency: 50 %

I don't know why he left without saying goodbye.

understand why

Frequency: 45 %

I can't understand why she would make such a decision.

ask why

Frequency: 40 %

I need to ask why the project deadline was moved up.

Idiomatic Expressions for why

• Phrase: why on earth
  Meaning: used to express surprise, disbelief, or frustration about something
  Usage: Why on earth would you do that? It makes no sense.