1- Theo sau t ất c ảcác tr ợt ừ( độn g t ừkhi ếm khuy ết): can, could, will,shall, would, may, might, ought to,must, had better, would like to, needn't, would rather, would sooner, be supposed to là nh ững động t ừkhông "chia",
V-bare2- Nh ững độ n g t ừtheo sau là "to verb" có 2 tr ườ n g h[r]