四下M5U1知识点
描述过去的事情和状态，用was或were
I was two. （那时）我两岁。
I was short.（那时）我很矮。
They were young then.他们那时很年轻。
I was two then. 那时我两岁。
Your hair was so short. （那时）你的头发很短。
You were so cute. （那时）你那么可爱。

描述现在的事情和状态，用am、is或are
Now I'm tall. 现在我很高。
Now they are old. 现在他们很老。
Now my hair is long. 现在我的头发很长。
I was very naughty too. 我现在也非常淘气。

M5U2 一般过去时的否定句
在was/were后面加not，通常缩写成wasn't/weren't
It wasn't beautiful then. 那时它不美丽。
They weren't old then. 那时他们不老。
She wasn't tall then. 那时她不高。
It wasn't clean then. 那时它不干净。
chick 小鸡；雏鸡
hen 母鸡