I am not sure about后面能接句子。例如:1、后接whether引导的从句:I am not sure about whether you can do the job.我不确定你是否能做到这份工作。2、后接动名词的句子:I'm not sure about the meaning of the word.我不太清楚这个词的意思。重点词汇:aboutabout 用法:在指“不久就要……”时,后通常接不定式,如about to start。也有接动名词,如about starting。但是不可再加表示时间的词,如about starting at once是错误的。在指“大约”的意思时,表达方式有about ten,about half等。注意ten和half都是明确的数量,about不该用在“多少不定”的词前,如about more than ten等。例句:They were knocking around together for about a year.他们交往大概有一年了。