Be動詞的時態:
Be動詞之原形為be,會隨主詞的人稱、數量及時間不同(限定)而變化;I現在式用am,You 現在式用 are,He 現在式用 is,主詞多數時一律用 are;因 Be動詞同時兼具有本動詞和助動詞之特性,故否定句中直接加not於其後,am not 不可縮寫,are not 可縮寫為aren’t,is not可縮寫為isn’t;ain’t為俚語之用法。
現在式:(am , are , is )
1. 表示經常性的狀態
2. 表示不變的事實與真理
現在式的句型
Mary and Jane are teachers.----- (肯定句)
Mary and Jane are not teachers.- (否定句)
Are Mary and Jane teachers?---- (疑問句)
What are Mary and Jane?-------- (疑問句)
The tree is very tall.--------------- (肯定句)
The tree is not very tall.----------- (否定句)
Is the tree very tall?---------------- (疑問句)
How tall is the tree?---------------- (疑問句)
凡是疑問句,be V必移至主詞之前。
過去式:(was , were) 表示在以前、過去的某一時間的狀態。
am 和is 的過去式為was,而現在不是;was not可縮寫為wasn’t
are的過去式為were,were not可縮寫為weren’t;ain’t為俚語之用法。
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過去式的句型
We were good friends before.------- (肯定句)
We were not good friends before.-- (否定句)
Were you good friends before?----- (疑問句)
How were you before?--------------- (疑問句)
He was short ten years ago. ----------(肯定句)
He was not short ten years ago.----- (否定句)
Was he short ten years ago?--------- (疑問句)
How was he ten years ago?---------- (疑問句)