Question

3) They will deliver letters​

Answer 1

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Maybe you are asking for passive voice

so it's passive voice will be :-

$passive \: = >$

The letter will be delivered by them.

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• They is changed to them in objective case. (In passive)

• Future indefinite tense changes into future continuous in passive voice. ( will+be)

$hope \: it \: would \: help \: you$

Answer 2

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Change it in passive voice:-

They will deliver letters.

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Passive voice of given sentence is:-

The letter will be delivered by them.

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There are two kind of voices:-

1. Active voice
2. Passive voice

Active voice- has a subject that acts upon its verb.

Passive voice- is a recipient of a verb's action.

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