你那句是对的，也可以说
We sincerely look forward a cooperation with you!
We sincerely hope for a cooperation with you!
We sincerely look forward to collaborating with you.
我们真诚地希望我们能与你合作！
感觉楼主的的比楼上所有的还好些呢.
我觉得也可以说
We sincerely expecting to cooperate with you!
cooperate 至少要是动词呀，别整名词形式
We sincerely hope that we can cooperate with you!
没错！
We sincerely hope that we can cooperate with you!
对的~cooperate可能有点错~单还是可以的
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