With the following structures, check whether they are determinate or indeterminate, stable or unstable, and without doing any calculation, sketch to show the shear force diagram, the bending moment diagram, and the deflection curve of the following structures. In the bending moment diagram, indicate which side is in tension, and which side is in compression. If the shape is nonlinear, indicate the order of the equation $($e$.$g$.,$parabola $=2$nd order$),$ also indicate where the maximum moment and maximum deflection might occur.$($a$)$ a simply$-$supported beam with a pinned support at A and a roller at B subjected to a uniform load and apoint load as shown.