Problem $1$:

For the given structures and statics loads as shown in a$)$ and b$),$

construct the influence lines for $A_y,B_y,$ and internal shear at $1,V_1$ and internal moment at $3,M_3$ for a$)$

construct the influence lines for ${}_y,D_y,$ and internal shear force at $1,V_1$ and internal moment at $3,M_3$ for $b$;

use the influence lines to determine reactions ${}_y,B_y,$ and internal shear at $1,V_1$ and internal moment at $3,M_3$ for a$)$;

use the influence lines to determine reactions $A_y,D_y,$ and internal shear at $1,V_1$ and internal moment at $3,M_3$ for b$)$;

a$)$

b$)$

Note: $1)$ you can check your results by using equilibrium equations. $2)$ Point $1$ is at middle of $AB$; Point $3$ is at the middle of $CD.$