这句话几个句子,几个主谓宾,分别是什么
We wish,however,to make it clear that in our future transactions,involved for each transaction is less than US$5,000 or the equivalent in Renminbi
Should the amount exceed that figure，payment by letter of credit will be required.
没写完，补上后半部分
involved在这里做定语，形容词，还是谓语动词。exceed呢，should是怎么回事，