小學英文問題

"be" 這個動詞....是可以分為"現在", "過去" 及"將來"....
"現在"(即現在所發生的事) :
is (用於he, she it)
am (用於 I , 即係 I AM)
are ( 用於 you, we, they)
例句: i am a primary three pupil. 我現在是三年級學生。

"過去"(當然係指過去啦) :
was (用於 i, he, she, it)
were (一般用於 you, we, they, 但亦可以用 "i")
不過留意.....同果句句子係 " i were a primary three pupil....即係指呢個不是真實或者是不能成真的事.....或是一個wish.......多數會係咁用: 例如: If I were you, I would not do that silly thing. 即係話"如果我係您....我就不會做這件傻事了"....因為"我" 永遠不能變成"您".....所以係用 "I WERE".....)

至於您問題內既句子....
要視乎整篇文章的意思.....
如果係想表達"我而家係三年級學生"...就應該係" I AM A PRIMARY THREE PUPIL."
如果係想話我以前/曾經係一個三年級學生.....就係" I WAS A PRIMARY THREE PUPIL."


希望幫到您~~~!!!!

2006-12-14 17:34:39 補充：
順帶一提 " used to be" 不是由 "be" 轉化而成的動詞....be 只可變成: is, am, are, was, were.....而used to be 係指"習慣"...例如: i used to be a primary three pupil.....即係指 "我習慣了成為三年級的學生"...

1) I am a primary three pupil.
be - verb to be (is, am ,are, was ,were)
change depending on the tense, subject.