You use a "specific determiner" when people know exactly which thing(s) or person/people you are talking about.
The specific determiners are:
|The definite article : the|
|Demonstratives : this, that, these, those|
|Possessives : my, your, his, her, its, our, their|
- The dog barked at the boy.
- These apples are rotten.
- Their bus was late.
You use "general determiners" to talk about people or things without saying exactly who or what they are.
The general determiners are:
|the indefinite articles : a, an|
- A man sat under an umbrella.
- Have you got any English books that I could have?
- There is enough food to feed everyone.