The modal verbs are:

can could
may might
shall should
will would

We use modal verbs to show if we believe something is certain, probable or possible (or not). We also use modals to do things like talking about ability, asking permission making requests and offers, and so on.


Hello Fuente,

I'm afraid we don't offer help on exercises from elsewhere. While we're happy to provide explanations of our own material, we are a small team here and cannot provide explanations of tests, homework or exercises which others have written. This is a job for your teacher, or else for the author of the material (who should have a key available for you to see).

You can find many resources online and on LearnEnglish on these areas. For the first do a search for 'polite requests in English'. For the second, search for 'contrastive stress'.


Best wishes and good luck,


The LearnEnglish Team

Hey Peter

I want to thank you for taking your time in helping me, I had found many resources!
I really appreciate your cooperation!

Have a nice week!
Regards from Italy!


Sir, You must have done that. haven't you or mustn't you ?

You might not have done that. have you or might you ?

what Should I use as tag questions ?

Hello SonuKumar,

I'd recommend 'right?' in a case like this. That's what I'd do as a native speaker. I honestly don't know what the correct verbal form would be and I haven't been able to find the answer in my reference works, either. Perhaps a form exists, but if so, it would probably sound quite unusual these days. For these reasons, I'd recommend 'right?', which performs the same function as a question tag.

All the best,
The LearnEnglish Team

If I write an academic essay, which modal verb (could or would) will be more suitable to express a possible out come, for example , air pollution would or could be the underlying cause lung cancer.

Hello Annamol,

For that specific sentence, I would recommend 'could' over 'would'. You can read more about both verbs on the pages linked to below.

All the best,
The LearnEnglish Team

Sir, He comes from his work and goes somewhere here so He must live here if we have to rewrite this last sentence so should we write it like this He definitely lives here, He probably lives here or we imagine he lives here ?

Sir, Though I know that we can't use 'Could' for past until we have two occasions, one of which shows past like this (I could run fast when I was a child) But with adverb like 'past and before' Can we use 'Could' like this I can't do it now But I could do it before or in the past or Just simply I could do it before or should we always say I was able to do this ?

Hello SonuKumar,

You can use 'could' to talk about past general ability (like in the sentences you ask about). It's also common to use 'used to' ('I used to be able to do it'), but there's nothing wrong with 'could'.

All the best,
The LearnEnglish Team

can you help me with this:
1. Choose the best answer to complete the following:
1) You will have to carry out the agreed program....... your own personal feelings
a) no matter
b) whatever
c) whatever are
d) however