これこそまさに私が探していた本です。
This is exactly the book I was looking for.
What he says is truly correct.
Indicates that something happens at the very moment or in the exact situation described. Often followed by 〜する時 or 〜の瞬間.
The phone rang just as I was about to leave.
Right at that moment, the power went out.
just about to; on the verge of
Describes an action or event that is imminent. Often used with verbs in the volitional or dictionary form + とする/としている.
He was just about to reveal the secret.
She looks like she's on the verge of tears.
really ought to; certainly should
Used in the pattern まさに…べき to express strong obligation or natural expectation. Somewhat formal or emphatic.
This is a discovery that really ought to be noted.
His efforts certainly should be praised.
This work is truly a work of art.
Right at the moment the train was about to leave, he came rushing in.
The sun is just about to set.
Helping people in trouble is exactly what we ought to do.