Determiners come at the start of a noun phrase

                                Specific                                                 General
                                                                Specific
When the person we are talking to knows exactly what we are talking about.
Give me this book                            “This” is specific determiner
                                                General
When the a person talks about nothing in specific
                                Can I take an apple?                        “an” not specific

                                                         Type of Determiners

Articles ---- a, an, the
Possessive pronouns – his, yours, theirs, ours
Numbers – One, two, three etc
Demonstrative pronouns – this, that, these, those, such
Ordinals – first, second, 1st, 3rd, last, next, etc.
Quantifiers – few, a few,