UNIT 1 : Simple Present Tense, am/is/are
UNIT 2 : Simple Present Tense, am/is/are (questions)
UNIT 3 : Simple Present Tense, I am doing (present continuous)
UNIT 4 : Simple Present Tense, Are you -ing? (present continuous questions
UNIT 5 : Simple Present Tense, I do/work/have, etc. (simple present)
UNIT 6 : Simple Present Tense, I don't ... (negative simple present)
UNIT 7 : Simple Present Tense, Do you ...? (simple present questions)
UNIT 8 : Simple Present Tense, I am doing (present continuous) and I do (simple present)
