I. 1.An
2.an
3an
4.an
5.a
II. 1. A
2. Some
3 any
4 a
5 an
III (2) a
(3) sone
(4) a
(5) some
(6) any
(7) a
(8) an
(9) a
IV
There aren't any trees
Theres a lake
There isnt any sand
There are some mountains
There arent any houses
There isnt a island
V
There arent any lakes
There are some mountains
There are some trees
There isn't any beach