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this week
一般现在时态
一般过去时态
am, is, are的法则：
我用am,你用are.
is 紧跟他，她，它。
单数用is,复数全用are.
一般现在时态
was,were的法则：
我用was,你用were.
was 紧跟他，她，它。
单数用was,复数全用were.
一般过去时态
I am happy today!
I was sad yesterday.
am today
was yesterday
He was seven years old last year.
He is eight years old this year .
They were in China last week.
They are in Canada this week .
am
was
were
are
is
was
were
are
3. Read and find the past tense verbs.