Always be conscious with the if and only if conditions of a equation or a theory.

Theorem 1 and are equivalent infinitesimals if and only if.

定理1与是等阶无穷小的充分必要条件为.

I shall be pleased if you will help me with my work.

如果您帮我工作我交非常高兴.

I'll chance another game of cards if you will.

如果你愿意,我想再玩一盘纸牌试试.

We shall esteem it a favour if you will inform us soon.

如早日通知,则不胜感谢.

You shall have many opportunities of serving us, if you will.

你有的是机会报答我们, 只要你愿意.

Come, if you will.

你来吧!

If you will help us, we shall be very grateful.

如果你愿意帮助我们, 我们会很感激你.

Now , I'll tell you, Hawkins: if you like, I'll take you along.'

我说, 霍金斯,如果你愿意, 我可以带你一起去. ”

'stay at my house if you like, bird, " he said.

“ 鸟儿,乐意的话就住在我家吧, " 他说.

If you like it , take it, then.

如果你喜欢, 那就买吧!

We can go out if you like.

你如果喜欢,我们可以出去.

"Shall we stop talking about her?"— 'If you like.'

“我们不说她了好不好？”——“听你的。”

If yes, how are wages for this work determined?

如果有, 怎麽确定这工作的薪金?

If yes, then he will issue dispatch application to warehouse management department.

如果货款已到, 填写出库申请单给仓库管理部门,申请出库.

If yes, please attach a list of current agreement.

如果是, 请附有当前协议资料.

If yes, may we know the frequency that you estimate?

如是, 可以让我们知道频率大约为和 吗 ?

If yes, what type of cuisine do you prefer?

若会, 你会比较喜欢什麽类型的菜肴?

If yes, please list the name of the pay TV service.

如有, 请列明该项收费电视服务名称.

Explain to me how matters stand.

给我讲讲现在的情况.

We have seen how matters stand in this respect.

我们已经看到这方面的实际情况.