I can lift that easily. - When you are able to do something.
We must go out for a lunch. - There is a necessity in doing something.
Should I ask my teacher for help? - When you give someone a piece of advice.
I ought to go to the doctor. - When it is obligatory for you to do something.
You mustn't park here. - You are not allowed to do something.
I can lift that easily. - When you are able to do something.
We must go out for a lunch. - There is a necessity in doing something.
Should I ask my teacher for help? - When you give someone a piece of advice.
I ought to go to the doctor. - When it is obligatory for you to do something.
You mustn't park here. - You are not allowed to do something.