英语对话里经常需要表达"不太确定"、"大概是这样"、"我猜可能……"这类含义，但很多人只会一句"I'm not sure"或者"Maybe"，用起来单调，也不够自然。
地道的英语表达不确定，有一套丰富的词汇和句式，掌握之后无论是口语对话还是邮件写作，都会显得更自然、更有层次感。
表达"我不太确定"：比I'm not sure更丰富的选择
"I'm not entirely sure, but..."
比"I'm not sure"多了一层"不完全确定但有一定把握"的含义，后面可以接你的猜测。
例：I'm not entirely sure, but I think the meeting is at 3.
"I couldn't say for certain, but..."
语气上更正式，适合职场或邮件场景，表示"我不能完全确认，但……"。
例：I couldn't say for certain, but the project should wrap up by Friday.
"Don't quote me on this, but..."
口语里很常见，意思是"我说的不一定准，别当我说了算"，语气轻松。
例：Don't quote me on this, but I think Jake is the one handling it.
表达"我猜/推测"：让推断听起来更自然
"I would imagine that..."
表示基于经验或判断的推测，语气比"I think"更有分量，也更正式。
例：I would imagine that they'll need at least two weeks to review.
"It seems like / It appears that..."
表示根据观察到的现象做出的推断，不是主观猜测，而是有依据的判断。
例：It seems like the deadline has been pushed back.
"As far as I can tell..."
意思是"就我能判断的范围来说"，适合在信息不全的情况下表达有限把握的判断。
例：As far as I can tell, everything is on track.
表达"大概/差不多"：模糊数量和时间
"Roughly / Approximately"
比"about"更正式，常用于数字、时间、数量的模糊表达。
例：It takes roughly 20 minutes to get there.
"Give or take"
口语里很常用，意思是"上下浮动"、"差不多左右"，放在数字后面。
例：It'll cost around 200 dollars, give or take.
表达委婉意见：不确定但想说出来
"I could be wrong, but..."
表示"我可能不对，但……"，是表达不同意见时很好用的缓冲句式，不强硬，但能把自己的看法说出来。
例：I could be wrong, but I think we're approaching this from the wrong angle.
"There's a chance that..."
比"maybe"更有层次感，适合表达"有这种可能性"，语气客观。
例：There's a chance that the client will ask for revisions.
这10个表达覆盖了日常口语和职场写作里大多数需要表达不确定的场景。掌握这些表达的关键不是背下来，而是在练习输出时主动用——下次说到"不确定"，别停在"I'm not sure"，试着用"I couldn't say for certain"或"As far as I can tell"替换，用几次就熟了。