We can add the suffixes er, or, -ist to verbs or nouns to make nouns that describe people. We usually add -er and or to verbs and ist to nouns. Write the nouns for these words. Use your dictionary if necessary.
1 art artist ence
2 sing
3 drive
4 invent
5 science
6 economy
7 teach
8 play
9 photograph
10 direct
11 write
12 build​