It is "of much importance".
or you could also say.
"was very important to us."
11 juni 2010
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"His advice was of much importance to us."
11 juni 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 juni 2010
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!