Question

we must help the poor . It's is our duty (join the following sentence using infinitives)​

Answer 1

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It is our duty to help the poor.

Extra Information :

The infinitive is the base form of a verb, often preceded by 'to'. The word 'to' is frequently used with the infinitive, but is not an essential part or sign of it.

Here, the form 'to help' is the infinitive.

Answer 2

Answer:

It's our duty to help the poor.

Hope this helps :)