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The verb "küssen" is conjugated in second person singular, plural and in the third person with 'ß'

du küßt
er/sie/es küßt
ihr küßt

Is it incorrect if I use it for the others too? Also, why is it not "küßen" to begin with? Isn't any word with 'ss' allowed to be replaced by 'ß'?

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up vote 10 down vote accepted

It is spelled with double s in every case.

Have a look the answer to the question Is there a rule that dictates whether to use the eszett (scharfes S) or double s?.

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Oh, I got the conjugation from here. That's why I asked this question. Thanks for the link by the way. Good explanation in the answers. – thandasoru Nov 28 '12 at 17:01
It seems like that website still uses the old rules. The new (1996) rules are simple: Short vowel is followed by double s instead of ß. – Timbo Nov 28 '12 at 17:07
Don't forget diphthongs. They are aloways followed by ß. – Thorsten Dittmar Nov 29 '12 at 12:37
There are no short diphtongs, aren't there? So "diphtongs are always followed by ß" ist more of a corollary than an additional rule. – adhominem Sep 16 '15 at 13:40

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