Question

Quiero saber como hago esto, mi profesora de ingles nos hizo esto en una prueba lo cual me fue muy mal... 1° medio.
-Present simple, present continouous and present "to be" : read the sentences, identify the verb and tense and write complete negative form:
1.- he plays the piano
2.- i am studyng for the test
3.- i want a glass of milk
4.- it's ok
5.- my brother is a teacher
6.- they know my cellphone number
7.- your shoes are very dirty

Answer 1

1.  PRESENT SIMPLE. VERBO PLAY. HE DOESN'T PLAY  THE PIANO 
2 PRESENT CONTINOUS. AM. I AM NOT STUDYING FOR THE TEST
3 PRESENT SIMPLE. WANT. I DON'T WANT A GLASS OF MILK
4 VERB TO BE. IS. IT ISN'T OK
5 PRESENT SIMPLE.  IS. MY BROTHER ISN'T A TEACHER
6 PRESENT SIMPLE. KNOW. THEY DON'T KNOW MY CELLPHONE NUMBER
7 VERB TO BE. ARE. YOUR SHOES AREN'T VERY DIRTY