phrase-bigPhrase of the Week

I know what

A1 A2 B1- B1 B2 C1

A: What shall we do tonight?
B: I know what. Why don’t we go to the circus that’s just arrived in town? It could be fun.

We use this expression to say we have just had a good idea.

You can use this phrase in ………… language.
 Spoken
 Informal

Example 
A: What shall we do tonight?
B: I know what. Why don’t we go to the circus that’s just arrived in town? It could be fun.

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