短语：

　　on Saturday afternoon have to prepare for go to the doctor

　　have the flu help my parents come to the party meet my friend

　　go to the party too much homework go to the movies another time

　　last fall hang out after school on the weekend study for a test

　　visit grandparents the day before yesterday the day after tomorrow

　　have a piano lesson look after accept an invitation turn down an invitation

　　take a trip at the end of this month look forward to

　　the opening of

　　reply in writing go shopping do homework go to the concert

　　not…until

　　短语用法：

　　invite sb. to do sth. What + a/an + 形容词 + 可数名词单数 （+ 主语 + 谓语）!

　　help sb. （to） do sth What + 形容词 + 名词复数/不可数名词（+ 主语 + 谓语）!

　　be sad to do sth. see sb to do sth / see sb doing sth

　　the best way to do sth. have a surprise party for sb