This image appears to be a geometry problem in Vietnamese related to a rectangular prism (hình chóp vuông) with various geometric tasks to prove. Let me help you analyze the tasks:

1. Task (a): Prove that $EF \parallel MN$. From the statement, it's implied that $E$ and $F$ are midpoints of $SM$ and $SN$, respectively, so proving this will involve using properties of midpoints in parallel lines or using vectors.

2. Task (b): Prove that $EF \parallel SPQ$. This requires showing that line $EF$ is parallel to the plane formed by $SPQ$, using geometrical reasoning based on perpendicularity or projections.

3. Task (c): Find the intersection of two planes: $SMP$ and $SNQ$. This requires finding the line formed where these two planes intersect.

4. Task (d): Find the intersection of planes $SMQ$ and $ENP$. Similar to part (c), this involves identifying the line of intersection between these two planes.

Would you like help with the detailed proof or analysis of these tasks, or is there a specific part you'd like to focus on?