Assuming you mean by adding an accent to a letter - I have answered a similar question - click the related link.
then is a short vowel
The O could be a long vowel, but as OR is a special vowel sound because of its different pronunciation in US English (or) and British English (aw). Neither of the A's has a long sound.
The vowel "u" in Küche has a long vowel sound, pronounced like "oo" in English.
In English, the word "lime" has a long vowel sound for the letter "i", as it is pronounced as "lie-m".
The vowel sound in "seat" is the long vowel sound /iː/. It is pronounced as "ee" in English.
It can be considered long, in US English moreso than in British English, which pronounces the OR as oh-ah and uses the caret O (or/aw) to represent the O sound.
No, "A" is not considered a short vowel. "A" is a vowel that can make both short and long vowel sounds in English words.
No, the vowel in "pineapple" is short. The vowel sound in "pineapple" is typically pronounced as /æ/ in standard English.
The vowel sound is an "or" which is a long O in US English and a caret O (aw) in British English.
In the English language, "humAn" has a short vowel sound because the "A" is pronounced as "uh." A long vowel sound is when the vowel says its name like in the word "cAke."
Yes. The EA pair has a long E vowel sound, as in the word flee.
No, the word "mane" has a long vowel sound with the "a" being pronounced like "may-n" in English.