They like swimming in the sea.
I wrote a letter to my friend in Australia.
Tom's birthdayis in Jamuary.
The National Day is on Friday.
He read the book by himself.
Last Sunday morning,I played basketball with my friend Tim.
It is rainy today.My sister is unhappy.I sing a song for her.
Do you often go to school by bus or on foot?
They are singing and dancing under the trees.
Bill is staying at home because he is hill.请说明为什么in the sea 在海里write a letter to sb. 写信给某人in January 月份用inon Friday 具体某一天用onby oneself 自己做某事play with sb.和某人玩sing a song for sb. 为某人唱歌by bus乘坐交通工具用byon foot步行under the trees 在树下stay at home 呆在家