She is too tired to walk any longer
the problem was （so ）differcult that（we ）(couldn't) work outthe problem was too differcult for us to work out.(句意不变)the problem wasn't ()()for us to work outthe play was so boring that none of us liked to watch itthe play was ()boring for()of us to like to watch it好了就采纳the problem wasn't (easy )( enough )for us to work outthe play was ( too )boring for( all )of us to like to watch it