ex 1
1 isn't
2 aren't
3 is
4 'm not
5 aren't
6 'm
7 isn't
8 are
ex 4
My best friend isn't old. He is young
My books aren't interesting. They are boring.
The students aren't boring in the club. They are interesting and sociable.
My school isn't new. It is old.
Tests aren't difficult. They are easy.
Football isn't easy. It is difficult,but you should work hard.
