Be uncertain of

be [bi]

v. 是;有，存在;做，成为;发生; aux. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质;

uncertain [ʌn'sɝtn]

adj. 不确定的;不稳定的;不明确的;无常的;

un不，没有+certain确实的→不确定的，靠不住的

of [əv]

prep. 关于;属于…的;由…制成; aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];

Mike and I had a hamburger this afternoon, and we talked.

今天下午 Mike和我一起吃汉堡， 一起讨论。

When the accident happened, I was having dinner.

当意外事故发生时候，我在吃晚餐。

You were very kind. You brought out all your jewellery and you told me I could take anything I wanted. There were so many beautiful things that it was hard to choose. And then I saw a lovely diamond necklace with a big blue stone in the centre.

你太好了。当时你把所有的珠宝首饰全都拿了出来，而且说，我要什么就可以拿什么。漂亮的首饰太多了，实在难挑选。后来我终于看中了一条美丽的钻石项链，中间还嵌着一颗大蓝宝石。