Rules of English Grammer

https://englishcommunicationskill.quora.com/How-we-can-use-the-idiom-at-a-loss-in-daily-conversation-1?ch=10&share=b018ad56&srid=oDVbo

How we can use the idiom " at a loss " in daily conversation? Gaurav Vishnuvardhan (गौरव विष्णुवर्धन)'s answer: At a loss - being confused, unable to decide what to do or what not to do. This idiom indicates the mental condition of a person who gets confused while deciding what to say or what not to say, what to ask or what not to...

Difference between "can" and "could" :-

What is the difference between ‘can’ and ‘could’? Answer: Could is the past tense form of can. Ex.- He said,”I can solve this problem.” He said that he could solve that problem. * Can denotes present ability, power and capacity whereas could is used to show past ability, power and capacity. * * She can defeat her opponent.(means be able ...