如若的英文：
if

If you don't believe it, please wait and see.
如若不信，请拭目以待。

If, on the other hand, America found and followed a native line, the results were bound to be ungainly
如若美国不另辟蹊径，其结果必然流于粗俗。

A set of documents, for example specifications and records, is frequently called “documentation”.
一组文件，如若干个规范和记录，通常被称为“documentation”。

Should you require further information, I would be happy to supply it.
如若要了解更多情况，我将乐意提供。

When you book your reception with us, rest assured that all the arrangements will be handled to your exact instructions.
如若光临我处预订婚宴,其余的所有安排将按照你的嘱咐不折不扣地操办。

If she were alive today she would not be able to air her views on her favorite topic of conversation: domestic servants
如若她仍在人间，她将无法再就其热衷的话题---家仆---畅所欲言了。