汉译英：当我妈妈和我在一起时,我从不会感到无聊.

I never felt bored when accompanied with my mom。即：I never felt bored when I was accompanied with my mom。accompany,伴随、陪伴和……在一起,be accompanied with sb。另外楼主注意哈,boring是“使人无聊的”,修饰的一般是东西,如the class is so boring,这课可真无聊感到无聊的是bored,如果要说我很无聊,是说我感到很无聊,就是I am/feel bored。某人使我感到无聊就是I am bored with sb。根据语境,“别闹了,你这样很无聊诶”,按照语境就可以说you are boring,不过按照外国人的习惯一般不会说这句话,会说nonsense/useless之类的,或者说I am bored with you～这就是后话了祝好～