Hello.

There is one thing about adverb clause and noun clause that blows my mind. We can use "wheter or not" and "if" in both clauses, so what is the diffirence between these two? 

Best regards!

Ali

Original Post

Hello, Ali Reza, and welcome to the Grammar Exchange.

"if" can introduce adverbial (conditional) or noun clauses, while "whether (or not)" can introduce noun or adverbial (concessive) clauses. Is that what you are asking?

- I don't know if you are satisfied. (nominal)
- I don't know whether you are satisfied (or not). (nominal) 

- I'll be happy if you are satisfied. (conditional)
- I'll be happy whether you are satisfied or not. (concessive)

Last edited by Gustavo, Contributor

Hello, dear Gustavo.

Thanks very much, and I appreciate your and  your coworker hard working. 

I got the idea completely. But is there any diffirence between "if conditional clause" and "wheter conditional clause"? 

Best regards

Hello, dear Gustavo.

I think the last question wasn't enough clear, but at least, I have known that "wheter" never interduce a conditional clause. I have wrote the meaning of both last sentences. First sentence, I think it means that you will be happy, if I be satisfied. If I don't be satisfied, you won't be happy, right? Second sentence, you will be happy wheter I be satisfied or not. Being satisfied of me doesn't matter, right?Did these definitions interduce the meaning of two sentences enough clear? 

Best regards

Yes, the idea is correct. Note, however, that your post above is full of grammar and spelling mistakes, which you really should try to avoid.

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