Questions & Answers about Ben anahtarı kaybediyorum ve şifreyi unutuyorum.
Why do the words for "key" and "password" take different endings (-ı and -yi)?
Both words are getting the accusative case suffix because they are the direct objects of the sentence. Anahtar ends in a consonant and its last vowel is "a", so it takes -ı to become anahtarı. Şifre ends in a vowel, so it needs the buffer letter -y- to keep the vowels apart. Because its last vowel is "e", it takes -i to become şifreyi.
Why must we use the accusative case on these words at all?
In Turkish, you must use the accusative case when a direct object is definite or specific. Because you are losing "the" key and forgetting "the" password (rather than just losing "a" key or forgetting passwords in general), you have to mark them with the accusative suffix.
What is the dictionary form of "kaybediyorum", and why is there a "d" in it?
The dictionary form is kaybetmek (to lose). When we add the present continuous suffix -iyor to the root, the t changes to a d because it is followed by a vowel. This is a common rule in Turkish where hard consonants soften between vowels (t becomes d).
Why is the present continuous suffix "-iyorum" on the first verb, but "-uyorum" on the second verb?