I would like to have more practise for infinitives. From where i can learn the same

As you may already be aware, in an infinitive the base form of the verb is preceded by 'to' and acts as noun. It is also called as Verb-Noun.

Find out the infinitive in the following sentences:

I refused to tell a lie.

The girl wanted to watch a movie.

My mother would be happy to see me.

She is asked to address the audience.

To wake up early is a difficult task for her.

I did not intend to hurt.

You have no choice but to surrender.

To respect your nation is your duty.

This is not the time to repent.

I did want him to know about it.