请问We should learn to be grateful,为什么要加to be?

请问We should learn to be grateful,为什么要加to be? Learn to be grateful是什么意思 感恩,英语作learn to be grateful be grateful to be grateful for We learn to be ___kind______ (kind) to animals.请问,横线上为什么要填ki we should learn to be i__ when we grow up. 以learn to be grateful为题写一篇演讲稿. we should learn to be face with difficulties If he ( )help me,I should be very grateful to you.为什么只能填shou Learn to share learn to be grateful 英语演讲稿,不要太复杂,初中的就行. 以“Learn to be grateful to mum”主题写篇英语作文 To be an independent child,you should learn how to behave we