6. Tom is an intelligent boy. He is always at the top of his class

tom is such an intelligent boy that he is always at the tóp of his class

8. This is an expensive house. Nobody can buy it

this is such an expensive house that nobody can't buy it

9. The work is very hard. I can't finish it on time

the work is so hard that I can't finish it on time

10. This song is very simple. All of us can sing it

this song is so simple that all of us can sing it