Question

15. She ........... not
not ....... (go) to school since Monday,​

Answer 1

Step-by-step explanation:

The words for and since are used in sentences where the speaker wants to talk about something that started in the past and continues into the present.

For is used when specifying the amount of time (how long):

Since is used when specifying the starting point:

Answer 2

Step-by-step explanation:

she does not go to school since monday