Is it possible to compare tuples in oracle-compatible sql?

I'm not 100% if tuples is the term for what I'm talking about but I'm looking at something like this:

Table grades
user    grade
------------
Jim     B
Bill    C
Tim     A
Jim     B+

I know I can do:

SELECT COUNT(*)
FROM grades
WHERE (
   (user = 'Jim' AND grade = 'B')
   OR (user = 'Tim' AND grade = 'C')
);

But is there a way to do something more like this?

SELECT COUNT(*)
    FROM grades
    WHERE (user, grade) IN (('Jim','B'), ('Tim','C'));

EDIT: As a side note, I'd only tested with:

(user, grade) = ('Tim','C')

And that fails, so I assumed IN would fail as well, but I was wrong (thankfully!).