future tense in time clause

sounds wrong. "when I have been writing for 8 months" but why repeat?

Anonymous I will finish this book in January next year, when I will have written this book for eight months. << this sentence is correct or Incorrect ?

I will finish this book in January of next year, when I will have been writing it for eight months.

thank you ^0^ JohnBoz

JohnBoz sounds wrong. "when I have been writing for 8 months" but why repeat?

Hi. Welcome. Just a heads-up—we try to set a good example for the English learners here by always using complete sentences with standard punctuation, capitalization, spelling, style and grammar.

thanks oops, try again

Thanks.

Why is the (of) necessary?

JohnBozWhy is the (of) necessary?

I honestly don't know, but it is. You don't say "Tuesday next week", you say "Tuesday of next week". Same thing.

Give me a sentence, because I have been speaking English since I was born and have never put "of" in there once.

I'll see you next Tuesday.

enoon I will finish this book in January of next year, when I will have been writing it for eight months.

when I will have been writing it for eight months.

<< my brother tell me that " no future tense in time clause". but this time clause have future tense.
i don't understand T^T please, help me !

JohnBozI'll see you next Tuesday.

That's a different structure.

"Jack will arrive next Tuesday."

but

"Jack will arrive Tuesday of next week."

not

"Jack will arrive Tuesday next week."

however

"Jack will arrive on Tuesday next week."

which is equivalent to

"Jack will arrive next we

I have to go now but I suggest you try posting with inverted commas both of our phrases into google to see the usage

"in January next year"
"in January of next year"

You may discover a lot of people don't know your grammar rules. I wish I had that programme where you can check the usage by percent.