不知⋯⋯好
Explanation
这个结构用于表达在面对复杂情况或选择时，感到犹豫不决、难以做出决定，不知道怎样做才合适。
This structure is used to express hesitation or uncertainty when facing complex situations or choices, indicating that one doesn't know what to do or say that would be appropriate.
Examples
这件事很复杂，不知如何解决才好。
This matter is very complicated; I don't know how to solve it properly.
看他紧张得手心都是汗，我也不知说什么好。
Seeing him so nervous with sweaty palms, I didn't know what to say.
Related Grammar Points
所谓⋯⋯ 就是⋯⋯HSK 7七-九081
固定格式
“所谓……就是……”用于对某个概念或事物进行定义、解释或说明其实际含义，常带有主观判断或特定视角的意味。
The structure '所谓……就是……' is used to define, explain, or clarify the actual meaning of a concept or thing, often carrying a subjective judgment or specific perspective.
Examples (2)
房内没有一样值钱的东西，所谓家具就是这几把椅子。
There was nothing valuable in the room; what they called 'furniture' was just these few chairs.
他所谓的好家庭就是住在一栋大房子里，妻子穿着漂亮的衣服。
To him, what constituted a 'good family' was living in a big house with a wife dressed in beautiful clothes.
无非/不过/只不过/只是⋯⋯ 而已/罢了HSK 7七—九082
固定格式
“无非/不过/只不过/只是……而已/罢了”用于表示某事物或情况并不像表面看起来那么复杂或严重，只是很普通、很简单的，常用来淡化语气或解释原因。
The structure '无非/不过/只不过/只是……而已/罢了' is used to indicate that something is nothing more than what it appears, often to downplay its significance or explain a reason in a light-hearted manner.
Examples (4)
不要相信他，这无非是他的借口罢了。
Don't believe him; this is nothing but an excuse.
我这么说没有其他意思，不过是想鼓励他而已。
I said this with no other intention; I just wanted to encourage him.
她会做这道题，只不过假装不会而已。
She can do this problem; she's just pretending not to know how.
大家都说爱情很快就会过去，剩下的只是习惯罢了。
Everyone says love passes quickly, and what remains is merely habit.
以⋯⋯ 为⋯⋯HSK 7七–九083
固定格式
“以⋯⋯为⋯⋯”是一个固定格式，表示把某事物当作、作为或视为另一事物（如中心、主题、基础等）。
This structure is used to indicate treating or regarding something as the basis, center, theme, or other role.
Examples (2)
我们不能以自己为中心，要考虑别人的感受。
We cannot put ourselves at the center; we need to consider others' feelings.
她以和平为主题，创作了一部小说。
She created a novel with peace as the theme.
因⋯⋯ 而⋯⋯HSK 7七–九084
固定格式
该结构表示'因为某种原因而导致某种结果'，强调因果关系中的原因部分。
This structure indicates a cause-and-effect relationship where '因' introduces the reason and '而' connects it to the resulting action or state.
Examples (2)
我经常看到他因一件小事而快乐的场景。
I often see him become happy over something trivial.
她胆子很大，不会因一些奇怪的声音而害怕。
She's very brave and won't be frightened by strange noises.
反问句3：何必/何苦⋯⋯ 呢？HSK 7七—九129
强调的方法
‘何必/何苦…呢？’是反问句式，用于强调某行为没有必要或自找麻烦，表达说话人认为该行为不值得或不合理。
'何必/何苦…呢？' is a rhetorical question structure used to emphasize that an action is unnecessary or self-inflicted trouble, conveying the speaker's view that the action is unworthy or unreasonable.
Examples (2)
这么简单的事我又何必一件事分两次做呢？
Why would I split such a simple task into two parts?
我对谁都没有讲，何苦事先就让他们伤心呢？
I didn’t tell anyone, so why go through the trouble of upsetting them in advance?
（不过/但/可是 话又说回来，⋯⋯HSK 7七—九130
口语格式
这是一个口语中常用的转折表达，用于在承认前文所述情况（通常是不利或负面情况）后，引出另一个相反、补充或更积极的角度，起到缓和语气或转换视角的作用。
This is a common spoken expression used to introduce a contrasting or supplementary point after acknowledging a previous situation (often unfavorable), serving to soften the tone or shift the perspective.
Examples (2)
话又说回来，不能因为生病就失去希望。
But on the other hand, you can't lose hope just because you're sick.
但话又说回来，我们为什么不能把事情处理得对我们更有利呢？
But having said that, why can't we handle things in a way that benefits us more?