动词be的现在式和过去式的肯定式，否定式和一般疑问形式：
I am    I am not      Are you…?  Yes, I am.  No, I’m not,
I was   I was not      Were you…? Yes, I was.  No, I wasn’t.
You are  You are not    You were  You were not
He/She/It is ( isn’t)      Is he/ she/ it….?      Yes, he/she/it is. No, he/she/it isn’t.
He/She/It was (was not)  Was he/she/it…?    Yes, he/she/it was. No, he/she/it wasn’t.
We/You/They are (aren’t) Are we/you/they…? Yes, you/we/they are. No, you/we/they aren’t.
We/You/They were (were not)  Were we/you/they…?  Yes, you/we/they were. No, you/we/they weren’t.
               

e k!