My brother ? thirteen and l ?14.We ?both in Grade seven.(be):我不会呀!

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Mybrother?thirteenandl?14.We?bothinGradeseven.(be):我不会呀!Mybrother?thirteenandl?14.We?bothinGradeseve

My brother ? thirteen and l ?14.We ?both in Grade seven.(be):我不会呀!
My brother ? thirteen and l ?14.We ?both in Grade seven.(be)

:我不会呀!

My brother ? thirteen and l ?14.We ?both in Grade seven.(be):我不会呀!
is;am;are

is am are

is, am, are

My brother is 13 and I am 14. We are both in Grade seven.
这道题考的是be动词的用法。而be动词有三种形式。is(第三人称单数). am(只能修饰I) .are(第二人称you 和第一三人称复数,以及所有可数名词复数) 他们的过去式是:was, were

is am are,第三人称单数后面是is,第一人称单数后面am,第一人称复数后面用are