Question

Discipline must be maintained by us

Answer 1

Answer:

we must maintain discipline

Answer 2

Given sentence

Discipline must be maintained by us

Its active voice would be

We must maintain discipline

$\rule{200}2$

• Given sentence is in passive voice as the doer of action is not the subject and the sentence has 'by' before the doer of the action.
• To convert passive voice to active, look for the doer of the action and make it the subject. Here, the doer of action is 'us' which in active voice becomes 'we'
• Modal verb 'must' is not changed. The tense changes to its respective present tense. In passive, the verb is always in its third form.
• 'By' is removed from the sentence