Relative clause

hrsaneiHi.Is the following sentence grammatically correct?

I completed four courses under your supervision in which I received good grades. [N]

I completed four courses, in which I received good grades, under your supervision. [Y]

Thanks for your help in advance. [N]

Thanks

Hi . Thanks for your response.

As for the first sentence, I assume the relative clause should exactly come after the word it describes. I know the rule I wonder if it should be followed strictly in every context.

But Thanks for your help in advance is in widespread use and nothing is wrong about that.

According to that rule I assume the following sentences are wro

hrsanei As for the first sentence, I assume the relative clause should exactly come after the word it describes. Yes, of course it should.
I know the rule I wonder if it should be followed strictly in every context. why not?

But Thanks for your help in advance is in widespread use and no

Thanks Canadian for following up my question.

In my seccond example, which has appeared after Iran but it refers to the centre. The Iran country is not focused on various . . . but the centre is focused on . . .

Thanks

hrsaneiThanks Canadian for following up my question.In my seccond example, which has appeared after Iran but it refers to the centre. The Iran country is not focused on various . . . but the centre is focused on . . . Thanks

"the most extensive........studies in Iran" is all part of the description of the place you work.

It is the most extensive cen

Of course I take your word. Why shouldn't I?

I am just discussing this issue with you. Are you uncomfortable with it?

That sentence sounds fine to my ear too. I can confirm its accuracy intuitively but when it comes to grammar it seems there are situations in which the rule does not apply.

You maintain an excellent grasp of English, but bear in mind, it is not polite t