It is very pleasure +什么

It is a great pleasure to work with you / 或者 cooperate with you.

It is my pleasure to be working with you（我很高兴能与你合作）
或者
It is my honour to be working with you（这是我的荣幸可以与你合作）
都有这个意思

It is very pleasure +to do
it 是形式主语，真正的主语是后面的动词不定式。 pleasure 不可数名词 乐事趣事。“做什么什么是很快乐的事"

类似的举行还有It's fun to do something"做某事很快乐"
It's fun to watch TV at mome .在家看电视很有意思。

It is very pleasure cooperating with you.