It is "of much importance".
or you could also say.
"was very important to us."
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"His advice was of much importance to us."
11 Haziran 2010
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Was much importanT;
So is of + noun <<< is right, see
http://dict.youdao.com/search?le=eng&q=be+of&tab=&keyfrom=dict.top
But you should note that not every noun can be used this way, roughly the abstract nouns can. Like 'be of value', 'be of help', 'be of significance' etc. So 'be of noun = be adjective (of the noun)' eg importance vs important.
11 Haziran 2010
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Hâlâ cevap bulamadın mı?
Sorularını yaz ve ana dil konuşanlar sana yardım etsin!
Elaine
Dil Becerileri
Çince (Mandarin), Çince (Diğer), İngilizce, Fransızca, Almanca