Examples

他的权利受到侵害，理所当然得到赔偿。 → 理所当然

他们两情相悦, 走到一起是理所当然的。

They love each other, thus it is only natural for them to be together. → 相悦

他认为我给他礼物是理所当然的。

He reckons it's entirely natural that I should give him a present. → 理所当然

理所当然 → 然

They took it for granted that after the war a brave new world was to be ushered in.

他们理所当然地认为战后必将迎来一个美丽的新世界。

to take sb for granted

认为某人做的事情是理所当然 → grant

to take it for granted that...

认为...是理所当然 → grant

as a matter of course

理所当然的事 → matter

by its (very) nature

理所当然 → nature