Doubtless, + clause
置于句首并用逗号隔开，表示说话人主观上确信无疑，多用于较正式的书面语。
Doubtless, he will be late again.
毫无疑问，他又要迟到了。
无疑地；肯定地；确定地；很可能；毫不怀疑地。；无疑地；确定地
Without doubt; certainly; very probably.
无疑地；肯定地；确定地；很可能；毫不怀疑地。
Without doubt; certainly; definitely; very probably, in all likelihood; doubtlessly.
She will doubtless succeed in her new career.
她无疑会在新的事业中取得成功。
用法提示：副词“doubtless”表示“无疑地”，修饰整个句子，强调确定性。
The weather forecast is doubtless accurate for tomorrow.
明天的天气预报无疑是准确的。
用法提示：副词“doubtless”修饰形容词“accurate”，加强肯定语气。
He is doubtless the best candidate for the job.
他无疑是这份工作的最佳候选人。
用法提示：副词“doubtless”用于系动词前，表示对主语的强烈肯定。
置于句首并用逗号隔开，表示说话人主观上确信无疑，多用于较正式的书面语。
Doubtless, he will be late again.
毫无疑问，他又要迟到了。
位于情态动词之后、实义动词之前，是副词最常见的位置。
She will doubtless forgive you in the end.
她最终肯定会原谅你的。
用于对过去情况的推测，表示说话人认为某事当时几乎肯定会发生。
They would doubtless have won if she had played.
要是她上场了，他们肯定就赢了。
grammar · medium
易错句子I am doubtless whether the news is true.
正确表达I am doubtful whether the news is true.
doubtless 是副词，意思是“无疑、必定”，不能放在 be 动词后作表语表示“拿不准”。当主语是人并表示怀疑、不确定时，要用形容词 doubtful（感到怀疑的），所以 I am doubtless whether… 应改为 I am doubtful whether…。
grammar · medium
易错句子I have doubtless that she will win the match.
正确表达I have no doubt that she will win the match.
doubtless 是副词，不能充当动词 have 的宾语。表示“毫不怀疑、确信”，英语用名词短语 no doubt，构成 have no doubt that … 这一固定搭配；副词不能占据这里的名词位置。
grammar · medium
易错句子This is a doubtless fact.
正确表达This is an undoubted fact.
doubtless 只能作副词，不能像形容词那样直接放在名词前作定语。修饰名词、表示“不容置疑的”时要用形容词 undoubted，所以 a doubtless fact 应改为 an undoubted fact。
undoubtedly 语气更强、更正式，只用于确定的判断；doubtless 还可表示“很可能、想必”，语气略弱。
doubtful 是形容词，表示“不确定、有疑问”，与 doubtless 词形相近但意思相反，也不能作状语修饰整句。
surely 多用于主观推测或反问，可带质疑语气，位置也较灵活；doubtless 偏向客观断言，更正式。
无疑会；必将
The new policy will doubtless face criticism.
新政策无疑会面临批评。
无疑是真的；确实如此
It is doubtless true that hard work pays off.
努力终有回报，这无疑是真的。
无疑是由于……
The rise in prices is doubtless due to supply shortages.
价格上涨无疑是由于供应短缺。
无疑是这样；情况肯定如此
It is doubtless the case that technology has changed our lives.
技术改变了我们的生活，情况无疑如此。
无疑意识到……
She was doubtless aware of the consequences.
她无疑意识到了后果。
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正如你无疑知道的
As doubtless you know, the deadline is tomorrow.
正如你无疑知道的，截止日期是明天。