How can you be so sure?中的be可以换成are吗?

How can you be so sure?中的be可以换成are吗? 英语翻译翻译How can you be so sure that he would do you no harm?Ho how can i be sure Don't be so nervous .Try it _________ and you are sure to be 用be sure ,be not sure,are you sure...be sure of的相应形式填空 If you have a meeting,how can you be sure that the other per are you sure be afraid用法! Some ads can be ________,so make sure that you need the thin So be sure you are in a happy mood while eating.中文意思 how can you be so foolish?和She ought to be praised. Don't be so sure请问这里把be去掉可以吗?是不是一定要有呢? HOW CAN I BE SURE?唱这首歌的歌手是谁?