真的?

Really? *“真的吗?”。询问对方的语气，也常说Oh, really?

He's 38. (他38岁。)

Really? (真的?)

Are you sure? *“敢肯定吗?”，想要确认的心情，要比上句稍强。

你是认真的吗?

Are you serious?

I want to break up with you. (我想和你分手。)

Are you serious? (你是认真的吗?)*有些怀疑对方的语感。

开玩笑呢吧?四级计分器

Are you joking?

I quit my job. (我把工作辞了。)

Are you joking? (开玩笑呢吧?)

Do you mean it? (是真的吗?)

Are you kidding? (是说着玩吧?) *kid 常来表示“耍弄，开玩笑”。

我怀疑。

I doubt it. *表示对别人的话抱有怀疑的心情。

Do you think you'll get a raise? (你觉得你能涨工资吗?)

I doubt it. (我怀疑。)

It's doubtful!

I don't think so. (我不这样认为。)

I wouldn't bet on it.

It's chancy. *俚语。

It's iffy. *非常随便的说法。

听起来可疑。

It sounds fishy to me. *fishy 除了表示“鱼的，像鱼的”之外，它还有“靠不住的，可疑的”意思。

What do you think? (你怎么想?)

It sounds fishy to me. (听起来很可疑。)

It sounds suspicious to me.

It sounds funny to me.

Something's fishy.

I smell a rat. *smell a rat 为短语，表示“感到有可疑之处”、“事情很可疑”的意思。