a useful lesson for learners of Turkish :

You have a funny strategy of introducing a package of suffixes without explaining what suffixes they are like

                  Verb + seydi/saydı , verb + erdi / ardı / irdi / ırdı / urdu / ürdü

It might work. Especially with learners who have the chance to use Turkish a lot. Instead of detailed grammatical analyses they just gather these packages to their mind.

But when are your students going to learn vowel harmony? Are you going to explain it over and over until doomsday?

i agree with you abla.

i think giving only one form of the suffix is enouh for the learners

but it is necessary for beginners

 Rahat gece, hoş bir mehtap bul bana,

 O zaman anlatayım bak; her şeyi sana !