A. Sums are done by me.
B. Sums are being done by me.
C. I must be doing the sum.
D. Sums must be done by me.
Given sentence is in Present continuous tense.
Rule :
Subject + (is /am / are) + V3 + being + Other agents.
A. Sums are done by me.
B. Sums are being done by me.
C. I must be doing the sum.
D. Sums must be done by me.
Given sentence is in Present continuous tense.
Rule :
Subject + (is /am / are) + V3 + being + Other agents.