Find the axis,vertex,focus & equation of directrix for the parabola $y^2=4ax$?

Question

$\begin{array}{1 1}(a)\;y=0,(0,0),(a,0),x+a=0\\(b)\;x=0,(0,1),(-a,0),x+2a=0\\(c)\;y=0,(0,1),(a,0),x^2+a=0\\(d)\;y=0,(0,0),(0,-a),x^3+2a=0\end{array}$