Write a note to Mr.Robinson,the Assist Purchasing Manager 这里是一个祈使句,当然要用动词原形例如：Sit down
按你说的Suggesting a meeting to discuss future delivery 是做主语吗?做主语的除了我们常规知道的 he she tom 之外,就是动名词短语做主语（Doing homework is important for us student ）和从句做主语：（What I want is only your care ）,动词是可能做主语的,他只能出现在谓语的位置