"去爷爷的房间"的英文表达是 "go to grandfather's room"。
其中，"go" 是动词，意思是 "去"；"to" 是介词，意思是 "到"；"grandfather" 是名词，意思是 "爷爷"；"room" 是名词，意思是 "房间"。
下面是几个使用 "go to grandfather's room" 的英文例句及其中文翻译：
Can you please go to grandfather's room and check on him? (你能不能去爷爷的房间看看他?)
I need to go to grandfather's room to get his medicine. (我要去爷爷的房间取他的药.)
My grandfather always pkes it when I go to his room to visit him. (我爷爷总是喜欢我去他的房间拜访他.)