若是的英文：
if

But if it be a question of words and names, and of your law, look ye to it; for I will be no judge of such matters.
但所争论的，若是关乎言语，名目，和你们的律法，你们自己去辨吧。这样的事我不愿意审问。

If you think that, you are gravely mistaken.
你若是那样想，就大错特错了

If you keep your nose clean, the boss might promote you.
你若是规规矩矩的,老板就可能提拔你。

Fruit juices ferment if they are kept a long time.
果汁若是放置很久，就会发酵。

If I cant borrow the money I shall have to manage without
我若是借不到那笔钱,那就只好撑下去了。

If you can't do the work yourself, pass it on to someone who can.
这项工作你若是做不了，就转给一个能做的人。

If you've thought that investment advisors were hired to invest, you may be bewildered by this technique.
若是你认为投资顾问是被请来投资的，那你就大错特错了

What about the odd chance that you do put an innocent man in the dock?
若是你真的把一个无辜的人送上被告席了呢？

To embrace her was like embracing a jointed wooden image.
若是拥抱她，那感觉活像拥抱一块木疙瘩。

By wielding a knife in defence you run the risk of having it used against you.
若是挥刀自卫，有可能会被夺去而反受其害。