The infinitive form of a verb is the verb in its basic form. It is the version of the verb which we see in a dictionary. Generally, the infinitive form of a verb is preceded by ‘to’ (for example, to be, to learn, to get).
I use my grammar book to practise English.
Ramesh studies hard to get better marks in examination.
Suresh goes to the gym to bea body-builder.
He works hard the whole day to feed his children.
She practices singing to be a playback singer.
Infinitives are used to explain why we do something.
Why are you cooking the food?
To help my mother.
Why do you go to morning walk?
To be healthy.
Use the infinitive with ‘to’.
I play cricket to have fun.
I went to the market to bring some vegetables.
We say… We don’t say…
He went to the ground to play with his classmates. (NOT He went to the ground play her classmates.)
I’m going to circus to have fun. (NOT I’m going to circus for to have fun.)
I study 4 hours a day to get good marks. (NOT I study 4 hours a day to getting good marks.)