Idioms are used all the time and unless you recognize when an idiom is being used, what you read or hear ______ can easily be misunderstood 

—Would you like to come on Friday or Saturday? —______

Don’t forget to bring a dictionary next class. ___. I didn’t catch what you said.

I travel to the Binhai New Area by light railway every day, ________do many businessmen who live in downtown Tianjin.

The teacher will give us an interesting talk _______ you said.