Breakdown of Ben de doktorum.
doktor
doctor
ben
I
de
too, also (da after a back vowel) / even if (concessive particle after conditional) / and (linking clauses)
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Questions & Answers about Ben de doktorum.
Why is de written as a separate word instead of being attached to Ben?
When de (or da) is written as a separate word, it means "too" or "also". If it were attached to the word as a suffix (Bende), it would mean "at me" or "on me" (indicating location). So, Ben de means "I also" or "Me too".
Since doktorum already means "I am a doctor", do I have to include Ben in this sentence?
Normally you can drop Ben, but here you need it because of de (too/also). You are saying "I also am a doctor", comparing yourself to someone else. The word de always follows the word it emphasizes, which in this case is the pronoun Ben.
What is the -um at the end of doktorum?
That is the personal suffix for "I". Turkish doesn't use a separate verb for "am", "is", or "are". Instead, you attach a suffix directly to the noun. doktor means "doctor", and adding -um makes it "I am a doctor".
Why does the personal suffix on doktor use a "u" (-um) instead of an "i" (-im)?
This happens because of a rule called 4-way vowel harmony. The suffix changes to match the last vowel of the word it attaches to. The last vowel in doktor is "o". The rule says that after an "o" or "u", the suffix must use a "u", making it -um.