teach前面是三单要加s吗?

teach前面是三单要加s吗? teach变单三加S还是ES teach one's math还是teach sb math? teach teach one's grandmother to suck eggs teach怎么样加S,就是变复数 where's the baseball前面为什么有the 不是球类前面不加the的吗? teach oneself 变成自学teach要变成过去式吗 以“I teach/taught/am going to teach my grandparent(s)/parents a new teacher will come and teach you English对吗?为什么teach不加s? 英语翻译once the center‘s schedule fills accordingly ,each teach teach的第三人称是加s还是es