【問題征答】請各位老師剖析下列句子成分，盡可能全方位詳盡，并找出一樣的結構及例句。

Im at a loss which to choose.

下面我們的不成熟怎么看，不妥之處請劉老師指正！

▲句子成分剖析

句子是I，be at a loss為系表結構，但這里的 at a loss 為 at a loss for或at a loss as to 之省略，相在乎義上等于一個及物動詞，其后的 which to choose 為賓語。比如：

Moved by their speech, I was at a loss what to say. 被他們的發(fā)言感動，我不知怎么說好。

I was at a loss for what to do next. 我不了解下一步該如何解決。

I’m at a loss as to how to explain the error. 我不知怎么樣講解這個錯誤。

其后的賓語也會是賓語從句。如：

She was at a loss which road she should take. 她不了解該走哪條路好。

I’m at a loss where I left it last time. 最后我把它放在什么地方，我目前一片茫然。

▲類似結構及例句

be at odds

The parents and teachers are still at odds about / over what to teach the students. 父母和老師對于教授學生什么內容建議不同。