Do words ending in a consonant require a linking vowel? If so, what is it?
Yes, they do. The linking vowel is identical with the third person singular possessive: -a, -e, -ja, -je. Nouns ending in a vowel do not require a linking vowel.
What are the plural possessive forms for asztal (table)
asztalaim
asztalaid
asztalai
asztalaink
asztalaitok
asztalaik
What are the plural possessive forms for kalap (hat)?
kalapjaim
kalapjaid
kalapjai
kalapjaink
kalapjaitok
kalapjaik
What are the plural possessive forms for fésű (comb)?
fésűim
fésűid
fésűi
fésűink
fésűitek
fésűik
What are the plural possessive forms for szoba (room)?
szobáim
szobáid
szobái
szobáink
szobáitok
szobáik
What are the plural possessive forms for csésze (cup)?
csészéim
csészéid
csészéi
csészéink
csészéitek
csészéik
What are the plural possessive forms for felelet (answer)?
feleleteim
feleleteid
feleletei
feleleteink
feleleteitek
feleleteik
What are the plural possessive forms for toll (pen, feather)?
tollaim
tollaid
tollai
tollaink
tollaitok
tollaik
(Regular, there are two consonants but the second is not a stop so no -j- element)
What are the plural possessive forms for terem (hall)