I saw(seewww.souquanme.com的过去式) a sprout.
I planted(plant的过去式) two leaves.

l saw my classmates played basketball yesterday.

I做主语 谓语动词必须用am
is搭配的主语只能是 she 搜趣网搜趣网he it
所以如果要用到一起只//www.souquanme.com能写复合句
I 搜趣网am a gird but he is not.

记住一般现在时中，I只和am连。所以是I am a boy. 我是一个男孩儿？如果是过去式，用was.