When he was building his house, he was particularly concerned about the north-eastern direction.

He likes writing poetry, and makes sure to write at least one phrase every day.

This issue may have secondary effects.

The queen has returned to the castle.

The Devonian period was a very important time in the history of the Earth.

They will never remarry after they divorced. Because 'once a married couple divorce, they can't get back together', as the proverb says.

His recovery was truly miraculous.

He has fundamental knowledge of mathematics.

He spilled a drop of coffee on the table.

I heard the sound of a steam whistle from afar.