Please be kindly to inform USA and ask them opinion.

pls kindly inform USA and ask their opinions.

pls kindly check the more shipping details with your forwarder.

你好
要加be
这句是祈使句
除掉please, inform 前面有了to说明是不定式

望采纳
2楼的说的and ask their opinions. 可以不改

我觉得不用加。我们平时的邮件往来用Pls kindly check等等等太多了，老外也这样用，至多是偏向于口语化，不会有什么问题。

Please be kindly to help me to check with your forwarder to have more shipping dates.

要加be
你这个是祈使句！
Be是谓语，前面有Be是没有问题，但是后面就有点问题了，正确的应该是：
and ask their opinions.

需要
除掉please, inform 前面有to说明是不定式，前面必须有动词原型