There's something I don't understand...

ちょっとわからないことがあるんだけど

for your information, I'm telling you

いっとくけど

Can I ask you a question?

いとすきいてもいいですか

Don't let this chance slip away!

みのがさないでね!

still the same, doesn't change

あいかわらず

If you had to choose which one would you choose?

えらぶとなると、どうでしょうか？

I/you/he/she is (being) greedy

よくばりだなー

if you insist

きみがそこまでいうなら

it's a secret

ないしょうだよ

that is definitely (without a doubt) the truth

じじつにちがいないよ

I'm hooked (i.e. fascinated by it)

こってるよ

on the right track, doing well

いいせんまでいってる

maybe, perhaps

かもしれないね

I think so

だとおもうよ

I have some bad news

あまりよくないしらせがあるんだ

I got carried away (a little excited)

ちょっとこうふんしっちゃった

I was daydreaming

えいぞうしっちゃた

I'm serious!

ぼくはほんきだよ

it's not going well / it's going badly

うまくいかない

How do you know?

なんでわかるの？

Wake up!

めをさませよ！

Hope it works out

うまくいくように

thanks for coming

きてくれてどうもありがとう

Is there something wrong with me?

ぼくのどくがいけないのか？

Please lighten up!

もっとげんきをだしてください

I'm glad you're here

きみがいてくれてよかったよ

Don't blame yourself

じぶんをせめないで

What's his name?  Who was that guy?

だれだっけ？

Please trust me!

まかせてください

I'm on my way

いまむっかてるよ

What a jerk!

ひどいやつだね

I was so upset

むかついちゃった

Failure is not an option!

しっぱいできないね

I/We must do our best

がんばらないと

I'm counting on you!

よろしくはたのむよ

Today was a nice day, wasn't it?

きょういいいちにちだったね

That's how he is (and there is nothing anyone can do about it)

かれのしょうぶんだからしがたない

No other way

ほかにみちはない

Where are you from?

ごしゅっしんはどちらですか

As you know ...

ごぞんじとおり

as you can see,

ごらんのように

Thank you for your kindness

ごしんせつにありがとうございます

definitely

ぜひ