buatkan kalimat present continuous

berikut kalimat present continuous tense :
a. the pattern of positive sentence
for example :
- I am reading a book now
- she is singing a song now
- we are studying English right now

b. the pattern of negative sentence
for example :
- you are not reading a magazine now
- he is not singing a song now
- they are not studying Math right now

c. the pattern of interrogative sentence
for example :
- are you reading a book now ?
- is she singing a song now ?
- are they studying English right now?