1 present_simple_form_be_positive
2 present_simple_form_be_negative
3 present_simple_form_be_yes-no-questions
4 present_simple_form_be_wh-questions
5 present simple form be mixed 1
6 present_simple_form_be_mixed_2
7 present simple form other verbs positive 1
8 present simple form other-verbs positive 2
9 present simple spelling changes
10 present simple form other verbs negative 1
11 present simple form other verbs negative 2
12 present simple form yes-no questions other-verbs
13 present simple form wh- questions other-verbs
14 present simple form mixed exercise 1 other verbs
15 present simple form mixed exercise 2 other verbs
16 present simple form mixed exercise 3 other verbs
17 present simple mixed exercise 1 be and other verbs
