（＝確実な） certain （fact）; sure（way）; assured （fact）; positive （proof）; authentic （news）; secure （possession）; safe （plan）; true （aim）; genuine （article）; conclusive （evidence）; convincing （proof）; decisive （proof）; definite （answer）; reliable （source）; trustworthy （quarter）; sound （doctrine）; solid （grounds）; firm （basis）; steadfast （friend）; established （fact）; competent （teacher）; good, gilt-edged （security, etc.）
His innocence is certain
I am sure of his innocence
I am certain of his innocence
I am positive of his innocence
I am convinced of his innocence.
I have heard the news from a trustworthy quarter
I have the news from a reliable source
I have the news on good authority.
He will certainly succeed―He is certain to succeed―He is sure to succeed―He will succeed to a certainty―of a certainty―of a surety.
I am sure I shall succeed
I am sure of success
I am certain I shall succeed
I am certain of success.
I am sure you will pass
I am sure of your passing
You are sure to pass
I am certain you will pass
I am certain of your passing
You are certain to pass.
I am sure he will do
I am convinced of his fitness for the position
I can recommend him with a safe conscience.
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"Surely," - James Matthew Barrie『ピーターパンとウェンディ』
"Certainly," - JACK LONDON『影と光』
"That's true," - F. Scott Fitzgerald『グレイト・ギャツビー』