using if condition in future tense

[Chamara Janaka]

Is the following sentence correct?

I'll let you know tomorrow morning, if I will be coming tomorrow.

 

[probus]

No. This construction is correct in many languages, but not in English. We use the simple present in such conditionals. "I'll let you know tomorrow, if I come tomorrow."

 

[justlearning]

Is the following sentence correct?

I'll let you know tomorrow morning, if I will be coming tomorrow.

Is there something wrong with "tomorrow morning"? Once I was told here that "today morning" is not natural.

 

[bhaisahab]

Is there something wrong with "tomorrow morning"? Once I was told here that "today morning" is not natural.

No, there is nothing wrong with "tomorrow morning". If we are referring to the following day, I would phrase the sentence like this, though: "I will let you know in the morning if I'm going to come tomorrow".

 

[Raymott]

Is the following sentence correct?
I'll let you know tomorrow morning, if I will be coming tomorrow.

Yes, this is correct.
The structure that I think probus is talking about, and which we don't use in English is: "If I will come tomorrow, I will let you know." We don't normally use "will" in the 'if' clause. For example, "If you [STRIKE]will [/STRIKE] go to Japan, you will enjoy yourself". You can normally omit 'will' and the sentence still makes sense; that's one sign of a wrong "will".
However, that doesn't mean that "will" cannot appear in an 'if' clause.
These are correct sentences:
"If I'll be at the party tomorrow (If I decide to go to the part tomorrow), I'll let you know beforehand."
"If you will do this job, please let me know by tomorrow".