in 表示时间时有“在……期间”的意思，如：in the morning, in 2008, in spring等。介词in 表示时间时，如果句子使用的将来时，表示在……之后如：
He’ll come back in a week. 他将于一周之后回来。
My birthday will come in three days. 使用的是将来时，in three days 指的是三天后
It’s difficult to find on the calendar. 在日历上很难找到。 Ah, I know. It’s February 29. 啊，我知道了，是2月29日 It’s difficult to do 做什么事情很困难
December 25 is Christmas Day. Before it people are very busy. 12月25日是圣诞节。在此之前人们很忙。
Before 在……之前，We must wash our hands before meals. 我们饭前应该洗手。
Mr.King is busy writing Christmas cards. 金先生忙着写贺卡。 be busy doing sth 忙着做某事的意思。如：
Mother is busy making Easter eggs. 妈妈忙着做复活节。
He wants to say Merry Christmas to his friends.他要祝贺朋友们圣诞节快乐。
Mrs. King is busy with her Christmas tree. 金太太忙着装饰圣诞树。 be busy with sth 忙于某事
The pupils are busy with their homework. 学生忙着他们的家庭作业。 February 29 is Wang Tao’s birthday. It comes every four years. 2月29日是王涛的生日。这个日子每四年才有一次。
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