Voice
I am doing sums.

Sums are done by me.
I must be doing the sum.
Sums are being done by me.
Sums must be done by me.

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Voice
In the following question, a sentence has been given in Active/Passive Voice. Out of the four/five alternatives suggested, select the one which best expresses the same sentence in Passive/Active Voice. Can those happy moments be ever forgotten by me?

Could I ever forget those happy moments?
Will I ever forget those happy moments?
Shall I ever forget those happy moments?
Can I ever forget those happy moments?

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Voice
Circumstances will oblige me to go.

I will oblige the circumstances and go.
Under the circumstances, I should go.
I shall be obliged to go by the circumstances.
I shall be obliged by the circumstances to go.

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