1
as yet + negative clause
常用于否定句，强调至今仍未发生。
The results are not available as yet.
结果至今仍不可用。
至今；迄今
先理解核心含义，再看它在真实句子里的用法。
至今；迄今
up to the present
The results are not available as yet.
结果至今仍不可用。
到目前为止。
Up to the present.
As yet, no decision has been made.
至今仍尚未做出决定。
The cause of the accident is as yet unknown.
事故的原因至今仍未知。
We have as yet received no response.
我们至今仍未收到回复。
常用于否定句，强调至今仍未发生。
The results are not available as yet.
结果至今仍不可用。
在疑问句中类似‘已经’，但更正式。
Has the report been completed as yet?
报告至今已完成了吗？
常与现在完成时连用。
The project has not started as yet.
项目至今尚未开始。
Not this
I finished my homework as yet.
Use this
I haven't finished my homework as yet.
as yet 通常用于否定句或疑问句，表示‘至今仍未’，不能用于肯定句。改为否定句并用现在完成时。
Not this
I didn't finish my homework as yet.
Use this
I haven't finished my homework as yet.
as yet 与现在完成时搭配，表示从过去持续到现在的状态，而一般过去时只表示过去动作，不延续到现在。需改为现在完成时的否定形式。
Choose the next layer that will help you use as yet with more confidence.
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use as yet naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
正式用语，多用于否定句或否定语境。
Dictionary facts from ECDICT, WIKTIONARY.