Grammar Unit 2: Present Simple and Present Continuous

Present Simple
Affirmative : Exercise 1,  Exercise 2,  Exercise 3
Negative: Exercise 1,  Exercise 2,  Exercise 3,  Exercise 4
Interrogative: Exercise 1
Remember that this tense is used for habits and routines with adverbs of frequency and some time expressions. You can practice this with Exercise 1  and  Exercise 2
Present Continuous
Affirmative: Exercise 1
Negative: Exercise 1
Interrogative: Exercise 1
Present Simple / Present Continuous
You can study the difference between these tenses here
Exercise 1,  Exercise 2, Exercise 3 , Exercise 4,  Exercise 5, Exercise 6
Exercise 7 
Exercise 8