They usually watch TV after supper.But this time they are listening to the radio.为什么watch不加es
问题描述：
They usually watch TV after supper.But this time they are listening to the radio.为什么watch不加es
答
因为主语是they～
es只用在第三人称单数的场合～
看：
He usually watches TV after supper.But this time he is listening to the radio.
只有主语是he/she/it等第三人称单数,才用es/s的啦~