1.) hyperbolic paraboloid
2.) Rewrite as $-4x^2-9y^2+z^2 = 36$ then divide by $36$ to get
$$-\frac{4}{36} x^2 - \frac{9}{36} y^2 + \frac{1}{36}z^2 = 1,$$
which is equivalent to
$$-\frac{x^2}{3^2} - \frac{y^2}{2^2} + \frac{z^2}{6^2} = 1,$$
the formula for a hyperboloid of $2$ sheets.
3.) cone
4.) hyperbolic paraboloid
5.) hyperboloid in $1$-sheet
6.) elliptic paraboloid
7.) ellipsoid