我能理解你失去宠物的痛苦。

I ___sympathise with your pain over losing your pet.

我理解你的处境，但我不能完全支持你的决定。

I ___sympathise with your situation, but I can't fully support your decision.

作为一位母亲，我完全理解你照顾生病孩子的辛苦。

As a mother, I can ___sympathise with your struggle of taking care of a sick child.