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If -di,-miş,-tir,-se suffixes are used after a noun or as a second tense they are called suffix verbs (ek fiil).And you use y buffer letter if it is necessary.
hasta is a noun. It ends with a vowel so you need to put y if you want to say hastaydı or hastaymış or hastaysa because here -dı, -mış, -sa are suffix verbs (because they come after a noun)
but
anla is a verb so you dont need to put y when you want to say anladım, anlamış, anlasa(because here -dı, -mış, -sa comes after a verb as the first tense)
and when you use two tenses such as "gitmişti"
miş is first tense, ti(-di) is second tense so -ti is a suffix verb but here it doesnt need any buffer letter because it doesnt come after a vowel.
but
when you look at this example "gelseydi", we still see y because -se is first tense and -di is second tense. So -di is a suffix verb and it needs a buffer letter because first tense -se ends with "e" vowel.
Result: If a suffix verb comes after a noun which ends with a vowel you need buffer letter, if a suffix verb comes after first tense and if that tense´s suffix end with a vowel you also need a buffer letter.
I hope you understand me 
Edited (1/31/2017) by gokuyum
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