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Red is used in many American expressions. It can be used to show happiness, as in the expression “a red-letter day”. This is a day when something special happens. The expression is probably based on church customs. For almost 600 years, church calendars have been marked with red to show special holy(神圣的)days. Today’s calendars are still marked that way with the dates of holidays and special days printed in red.
The expression “a red-letter day”is often heard in daily life. “A red-letter day” is a day that people are especially happy. It may be a day that you have waited for a long time, a wedding day, for example. Or it may be a day with a happy surprise. You might tell a friend that yesterday was a red-letter day, because you won some money in the lottery.
“Rolling out the red carpet” is another commonly heard expression. It describes an especially warm welcome of any kind. A city may “roll out the carpet ”for its baseball team, when the team arrives home after winning a championship. A group of supporters go to the air port to the greet the team. The red-carpet welcome includes a lot of cheering by thousands of fans, a parade, music and speech of praise by local statesmen.
Red is also used in some expressions that are not happy. “Red-handed ” is an example. To be caught “red-handed” is to be found in an act of wrong doing. The evidence is clear. You are guilty. Today we use the expression “ to be caught red-handed ”in situation(情况)that are not serious. For example, a mother might say she caught her son red-handed, taking cookies out of the cookie jar.
Some American Expressions with __小题1:___

Be used for_小题2:__ happiness	a red -letter day	a day that people are happy a day with a ___小题3:__
	rolling out the red carpet	describes an especially warm___小题4:_____
Be used in_小题5:expressions	to be caught red-hanged	to be found doing a wrong action can’t be used in a serious situation