Use of extra helping Verb - English Grammar

Use of Can, could, may and might-

Yadi sentence ke last mein main verb ke sath sakta hai, sakti hai, etc words aaye aur nishchitta ka bodh hota ho to 'Can' ka use karte hain lekin yadi nishchitta ka bhav na aaye to sabhi subjects ke sath 'may' ka use kiya jata hai.

Ab yadi aise words past mein aa jaye jaise- sakta tha, sakti thi, sakte the to 'can' ke place par 'could' aur 'may' ki jagah might ka use karte hain.

Aise sentence jab future mein aa jane par jaise sakega, sakegi etc words ke aane par use Present mankar 'may' athva 'can' ka use kiya jata hai.

Simple Sentence -
Subject + may, might, can or could + first form of main verb+ object.

As- I may read this book.

Negative Sentence -
Subject + may not, might not, can not or could not + first form of main verb+object.

As- I may not read this book.



Use of Should or Must-

Yadi sentence ke last mein main verb ke baad 'Chahiye' word laga ho aur nishchitta ka bodh ho to sabhi subjects ke sath 'must' aur nishchitta ka bodh na hone par sabhi subjects ke sath 'should' ka use karte hain.

Simple Sentence-
Subject + should or Must + first form of main verb + object.

As- You should do your work.

Negative Sentence -
Subject+ should not or must not + first form of main verb + object.


Use of 'Ought' and 'Sought'-

Yadi sentence ke last mein main verb ke baad 'chahiye tha' word attached ho to 'I' aur 'we' subject ke sath 'sought' aur sabhi others subject ke sath 'Ought' ka use karte hain.
Lekin aise sentence mein jab Nishchitta ka bodh ho to 'I' aur 'we' ke sath 'ought' and others subject ke sath 'sought' ka use karte hain.

Simple Sentence -
Subject + ought or sought + to + first form of main verb + object.

As- You ought to do this work.

Negative Sentence -
Subject + ought not or sought not + to + first form of main verb + object.



Use of Has, Have and Had on the place of Main Verb-

Yadi sentence mein main verb na diya gaya ho aur us sentence mein Kisi ke pass ya usse related ya uske adhikar mein kisi cheej ka hona paya jaye kahne ka matlab hai kisi 'vyakti' ka hona, kisi 'vastu' ka hona, kisi 'asthan' ka hona ya kuch bhi hona paya jaye to aise sentence mein present mein main verb ke roop mein 'has' or 'have' ka use, past mein 'had' ka use kiya jata hai.
Aisa sentence future mein nahi hota lekin 'future' mein aane par Shall aur Will ke sath main verb ke roop mein have ka use kar dete hain.

Simple Sentence -
Subject+ has, have or had + objects.

As- He has two books.

Negative Sentence -
Subject + don't, doesn't or didn't + have + object.

As- He didn't have a pen.