Use o present continuous:
The children
breakfast now.
We
Portuguese at this moment
a letter
Jennifer
to help you
My sister
in the park
O a) a) are having / aren't studying / is writing / is trying / am running
Ob) b) are having / are not studing / am writeing/is tring / is running
Oc) ) are having / are not studying/am writing / am trying /am running
Od) d) is having / is not studying / are writing / are trying / are running
e) e) are having / are not studying/am writing / is trying / is running​