Grandma often ____ us something about her past life?用 say,sp

tell

用tell 告诉的意思
say说的意思
speak也是说的意思，都是说语言的SPEAK English
talk一般是讲话的意思
反正这是很肤浅的了解，但我认为很容易了解

Grandma often tell us something about her past life.

tells 一般现在时三人称单数 tell sb. about sth
这几个词的用法分别如下
say +说话的内容
say to sb.对某人说
speak+语言
speak to sb.对某人说话
tell可以作“告诉”“讲述”
tell sb. sth 告诉某人某事
tell sb. about sth.告诉某人关于某事