1、be sure of sth 对某事很确定
2、be sure to do sth 一定会做某事
3、be sure that 对某事很确定 后面加句子
1、be sure of sth 对某事很确定
例句：I am sure of his guilt.我确定他有罪。
I am sure of his coming. 我确定他会来。
2、be sure to do sth 一定会做某事
例句：I am sure to close the window after school. 放学后我一定会关窗的。
I am sure to help you tomorrow.我明天一定会帮你。
3、be sure that 对某事很确定 后面加句子
例句：I am sure that he will achieve his goal. 我确定他会实现目标的。
He is sure that his mother will come to see him this afternoon.他确信他妈妈今下午会来看他。
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