Is your dad your best friend?

你爸爸是你最好的朋友吗？

Who's your best friend, Molly?

莫莉，谁是你最好的朋友？

Who is your best friend? Email me soon!

你最好的朋友是谁？快给我发邮件！

How long have you known your best friend?

你认识你最好的朋友多久了？

The situation here is so much worse because the loose lips were your best friend's.

这里的情况更糟，因为“祸从口出”的是你最好的朋友。

It is unforgivable to lie to your best friend.

对你最好的朋友撒谎是不可原谅的。

Your best friend is telling you a joke, but you can't catch it!

你最好的朋友在给你讲笑话，但你却不理解！

It's OK to let out your negative thoughts to your best friend or parents later.

以后可以把你的消极想法告诉你最好的朋友或父母。

Death becomes your best friend, men's only friend.

死亡变成人类唯一最好的朋友，

Your agenda will be your best friend.

你的日程表将是你最好的朋友。