oðulsunuz konuþacaðim  my attempt to say I will speak to your son!

Please correct if required. Thank youuuuuuuuuuuuuuuuuu

I think it should be  ´oðlunuzla´

It will be better if you say : oðulunuzla konuþacaðým- I will speak to your son

my vote goes for "sonunda"

I concur I´ll add some points here.

"la"/"le" suffix means "with", so "oðlunuzla konuþacaðým" means "I will speak with your son".

One important thing to notice here is that "oðul" turned into "oðlu". Some Turkish words lost their final vowel when you append a suffix beginning with a vowel. Oðul is one of such words. When you append "unuz" (your) suffix then "oðul" losts "u" vowel, and we got "oðl - unuz". Finally, appending "la" (not "le", because of vowel harmony), results in "oðl - unuz - la".

Here you can find a list of Turkish words which lose their last vowel:

http://turkishlanguage.co.uk/pocnoun.htm

You´re right!

Burun > burnu,burnum...