Cách sử dụng
The word "hard" can be used to describe something that is difficult or requires a lot of effort. For example, "This math problem is hard" means that the math problem is difficult to solve. It can also be used to describe something that is rigid or firm. For example, "The rock is hard" means that the rock is not soft or pliable.Lastly, it can be used to describe someone’s personality or behavior. For example, "He has a hard exterior" means that he appears tough or unapproachable on the outside. You would use the word "hard" to describe something when you want to say that it is tough or difficult.