Be uncertain of
不肯定..., 不确定...
🧩 词语组成解析
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;
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];
🗣️ 情景例句
I can see straight into the neighbors'backyard from here.
从这我可以直接看到邻居们家的后院。
I invited him to come in, but he wouldn't.
我请他进来，但是他不肯。
The railway station was big, black and dark.
火车站很大，又黑又暗。