其实我没看懂问题呢。。另外,原句有小错误,应该是Beingtiredafterfinishinghomework,Igotobed.这句话是没有错的。如果说要在动词前加什么词的话可以这样修改:BecauseIamtiredafterfinishinghomework,Igotobed.SinceIamtiredafterfinishinghomework,Igotobed.或者Iamtiredafterfinishinghomework,soIgotobed.或者IgotobedforIamtiredafterfinishinghomework.虽然大意没改变,不过这句话的语气和意思可能有点稍稍变动不知道我是否理解正确了LZ问题的意思?