I'm sure cars powered by solar energy will be popular in the near future.为什么powered前不加are?

I'm sure cars powered by solar energy will be popular in the near future.为什么powered前不加are? I'm sure. I'm not sure I’m sure about it. I'm sure we will. I'm not sure 快 I'm not sure yet. I'm sure win 翻译 I'm not sure()( 至今) I' m sure i can do I'm sure I am not wrong I'm sure of that意思 I'm sure they will come. I'm sure to do it myself 翻译：I'm sure you did I‘m sure you like it.翻译 如何提问 I'm sure we will. I’M sure后面跟什么