1.I 是主语,go是谓语,to sleep是宾语,with my bedroom light on是宾语补足语.意为：我去睡觉时,我卧室的灯亮着.
2.our teachers是主语,believe是谓语,that做连接词,引导谓语从句,if we did that做谓语从句,后半句we是主语,would是情态动词,concetrate是谓语,more on our clothes than our studies是宾语.意为：我们的老师们相信如果我们这么做,我们将集中更多在我们的衣服,而不是学习上.
3.only then放句首,整个句子做成倒装句,把will提前,i为主语,have为谓语,a chance of achieving my dream为宾语,
意为：只有到那时,我才有机会实现我的梦想
纯属个人理解,大致应该是这样吧
ps：第二句是不是少了个逗号啊?!,要不然翻不出来的,结构也会错,我纠结了n久了.应该是这样的吧.-------Our teachers believe that if we did that,we would concetrate more on our clothes than our studies.