In which sentence is the underlined clause an adverb clause? louis braille, who invented a way for blind people to read and write, taught his system to classmates. braille is a form of writing that enables blind people to read and write using bumps on paper that represent letters. you might encounter the writing system of braille wherever there are signs or maps. didn't know how to underline in this website so any thing that is capitalized is what was supposed to be underlined