〜たとたん（に）

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Only after; not until (realizing or experiencing something for the first time only after a certain event occurs).

Could you please do...? (A polite request used in business emails to ask a superior or client for a favor)

I hear that... / According to... (A polite way to report or relay a message received from a third party)

Am/is/are doing (The humble equivalent of 〜ています, used to describe one's own current actions or state to a recipient)

While; before (doing something while a current state exists, or before that state changes)

Must be; without a doubt. Used to express strong agreement with a statement or a certain deduction.