in（on） behalf of 代表

ineligible for， be 不被录取的

inferiority complex 自卑感

information bureau 万事通

innocent kid 清白无辜的人

inside dope 内幕消息

installment plan 分期付款

intensive course 精读课程

Is Frank in， please？ Frank在家吗？

Is my face red？ 问心有愧

Is that so？ 是这样吗？

Is this seat taken？ 这座位有没有人？

Isn't it ever？ 我同意你的说法。

Isn't it though？ 我同意你的说法。

Isn't my word good enough？ 我的话你也信不过吗？

It cost me a small fortune. 花了一笔小钱。

It isn't cricket. 不公平；不合理

It makes me sick. 我受不了。

It never rains but it pours. 祸不单行

it pays to do sth 值得做某事

It sounds inviting. 听起来很吸引人。

It was your fault. 那是你的错。

It will be just the thing. 刚好合适。

It would really come in handy. 它实在方便。

It's a piece of cake. 真是小菜一碟

It's about time you start thinking ahead 你该想想做些什么了。

It's been reserved. 这张桌子已经有人定了。

It's Greek to me. 对我犹如天书；我莫名其妙

it's high time 是……的时候了

It's nice you survived. 很高兴你还活着。

It's none of your business. 这不关你的事。

It's on me. 由我出钱

it's only to find out 只不过想打听一下