"A and B have a car." 的意思是：

其實both A and B，跟A and B的意思上是沒有分別，以下我引用一段文字：
"both Ａ and Ｂ" 意思是：Ａ 並且 Ｂ。
※ (1) Ａ與Ｂ要同一類型；
(2) 同樣著重Ａ及Ｂ；
(3) 單單 "and" 本已足夠，"both" 加強語氣。
例如： We both love and honor him.
Both you and I are students.
He is both a soldier and a poet.
如果"A and B have a car"是指A和B共同擁有一輛車的話，那麼以下的句子又怎解釋呢？His father and mother died five years ago.是否指他父親和母親五前一同死去。很明顯這句是他父母五年前死去，並沒有指出是一同死去。又：Peter and Mary are studying in University.都不是指他們在同一間大學裏讀書，而是指他們都讀大學所以， A and B have a car，是指A和B都有一輛車（同不同一部，就不得而知）我再引用【A University Grammar of English】對"and"的用法的其中之一的解釋： When a subject consists of two or more noun phrases coordinatedby and, a distinction has to be made between appositional and non-appositional coordination. Under non-appositionalcoordination we include cases that can be treated as an impliedreduction of two clauses. These have a verb in the plural: Tom and Mary are now ready(←→Tom is now ready and Mary is nowready) What I say and What I think are my own affair(←→What I say is...and What I think is...) 所以，你的”A and B have a car"可以看成：A has a car and B has a car.可參考以下網站：http://www.npc.edu.hk/staff/~ngtungying/english_grammar/

2007-04-24 17:53:24 補充：
若你想說，A和B共同擁有一輛車，可以說：A and B have a car together

http://fanyi.cn.yahoo.com/?source=0U

"A and B have a car." = (1)

A and B is two person. A car is only one.

(1) A和B共同擁有一輛車。

Hope it Helps you!

答案是 (1) A和B共同擁有一輛車。

A和B各自擁有一輛車是
A and B each has a car.
Both A and B have a car.

2007-04-23 23:19:05 補充：
英文不單是一種語言,而是一種文化