Excuse me? pardon? (reformulation)

So you're saying ...
Do you mean ...
If I understood correctly, ...
What I understand is ...
... is that right ?

fake it until u make it

一种自我期待的力量。是积极的心理暗示的做法。遇到困难瓶颈时，假装自己可以，久而久之你就真的可以。
推荐去看TED的一个演讲。Amy Cuddy: Your body language shapes who you are。

BTW: By the way
FYI: for your information, 意为"供参考"
例如：By the way as an fyi, it is now out of support.

polyglot [ˈpɑːliɡlɑːt] 通晓多种语言的人
It suddenly dawned on me 这令我茅塞顿开
sitcom 情景喜剧
gibberish [ˈdʒɪbərɪʃ] 莫名其妙的话; 胡话; 令人费解的话

I'm still working on it.
a complimentary glass of wine: 免费的; 赠送的
I'll go with ... 即 I'll choose 或者 I'll take

grab:

1. Wait for me please, I need to grab my coat.
2. Let's grab a cup of coffe.