1) I am buying her a good ring.
2) I am meeting her at the airport at ten.
In the present continuous, we add -ing onto the end of the infinitive (like the words in the brackets). So “meet” becomes “meeting”. In front of the verb we put “am” or “is” or “are”, depending on the subject. Here are some examples.
We are going to the beach.
I am reading this book.
She is painting a tree.
Ok. Indefinite pronouns are pronouns that are...well, indefinite.
They're pronouns like several, or everyone. They're incredibly vague. No
one cares about demonstrative pronouns. Relative and interrogative
pronouns are similar, but interrogative pronouns can only be used in
questions, while relative pronouns can be used in any context.
The most common is Chicago style.