Q

When should any pig be able to write？
猪什么时候可以写呢？

A

When it has been turned into a pen.
当猪变成笔的时候。

点睛一笔

pen作为名词不仅有“钢笔”的意思，也有“围栏”的意思。所以答案“When it has been turned into a pen.”可以理解为：①当猪变成笔的时候。②当猪被围栏围起来的时候。