📐 语法要点 理解规则，举一反三
1
一般现在时
表示经常发生的动作或客观事实。主语第三人称单数时动词加 -s/-es。
She studies biology. / I get ready for school every day.
2
be 动词用法
I am / You are / He-She-It is / We-You-They are。
I'm ready. The textbook is on the desk. They are in the lab.
3
指示代词 this/that
this 近指（这个），that 远指（那个），复数用 these/those。
This is my eraser. That is your school uniform.