Hi,
I thought there was a spelling rule that says that adjectives in nominative masculine form only end in ий if the previous consonant is a sibilant, like ш. But вчерашний's stem ends in н. Is вчерашний just a rare exception to the rule? Does the rule about sibilants at the end of an adjective stem also apply if the penultimate consonant is a sibilant?
If so, why isn't страшный spelled страшний? I must admit it doesn't look right to me spelled like that...
Is it anything to do with страх being masculine, and вчера being feminine?
Thanks in advance for answers,
Richard