试着做了一下：
1.My sister will come to England next year.
2.She will get a surprise if she comes.
3.We have a new house in the country.
4.I have invited my sister to stay witn us.
5.It is a very modern house.
My sister will come to England next year.If she comes,she will get a surprise.We have a new house in the country.So I have invited my sister to stay witn us.And it is a very modern house.
