Understanding chemical equations is difficult.

He has not yet reached the legal age.

I am learning how to solve ordinary differential equations.

I like making miso using koji mold.

That workman is working hard.

We should protect the environment for posterity.

He left the future affairs to me.

He went to school through the lane.

He is busy with public affairs and hardly has time for his family.

This road is under construction, so you cannot pass through.