I think his Japanese has improved quite a bit, hasn't it?

I worked all day and ended up being tired out.

I appreciate your efforts for the whole day today.

The Second Sino-Japanese War was a war that lasted from 1937 to 1945.

I found a big puddle in the park.

This cold is unbearable.

He continued to write that report all night.

If stress accumulates, it becomes easier to get sick.

I found a big puddle in the park.

After the rain, a large puddle formed on the road.