最好的朋友用英文怎么表达？

My best friend has been like a sister to me.

我最要好的一个朋友待我亲如姐妹。

He went off with his best friend's wife.

他和最要好的朋友的妻子走了。

She confided all her secrets to her best friend.

她向她最要好的`朋友倾吐了自己所有的秘密。

John's my best friend

约翰是我最好的朋友。

I found myself behind a curtain, necking with my best friend's wife.

我意识到自己在帘子后面吻着至友的妻子。