we need to eat well every day为什么加to,need to是短语?

we need to eat well every day为什么加to,need to是短语? we need to sleep well every day. we need to sleep eight or nine hours every night.为什么need后加to we need to well every day ,so we losts have helthey(健康的,有可能写 We ______(too) need to exercise every day. We need _____(exercise)to keep in healthy every day. we need to eat_____（health） food every day The fiowers need---(water)every day.是water还是to water.为什么参考答案 We need a lot of energy to study every day .这里的to study是动词不定 We need to do morning exercises every day to keep in good __ need ,we ,eat ,to ,get,food ,to ,enerty (组成句子) Students need to get to school 什么 什么 every day