1.My healthy lifestyle helps me get good grades.2.Good food and exercise help me to study better.

问题描述:

1.My healthy lifestyle helps me get good grades.2.Good food and exercise help me to study better.
这里的help为什么1.加S而2.没加

第一句主语是 my healthy lifestyle 为第三人称单数,help要写为三单形式
第二局主语是 good food and exercise 为复数,用原型即可.