Exercises
1) https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises
2) https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex02
3) https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex03
4) https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex04
5) https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex05
6) https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex07
7) https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex08
8) https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex09
9) https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex10
10) https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/tests?test1
11) https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/tests?test2
12) https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/tests?test3