TOM AND BOB IS A GOOD FRIEND.TOM AND BOB ARE GOOD FRIENDS.这两句有何区别,有无对错之分?还望见教

TOM AND BOB IS A GOOD FRIEND.TOM AND BOB ARE GOOD FRIENDS.这两句有何区别,有无对错之分?还望见教
TOM AND BOB IS A GOOD FRIEND.TOM AND BOB ARE GOOD FRIENDS.这两句有何区别,有无对错之分?还望见教

TOM AND BOB IS A GOOD FRIEND.TOM AND BOB ARE GOOD FRIENDS.这两句有何区别,有无对错之分?还望见教
首先,第一句是错误的.不能说他们是"一个好朋友",因为他们有两个人.
第二局则是正确的,因为用了复数形式,表示他们俩是好朋友.

汤姆和鲍勃是我的好朋友。 。。。汤姆和鲍勃是好朋友。