He has already finished writing the report, so we use the present perfect form.

She is learning the grammar of the present progressive form.

Zaijiro is my best friend.

The coexistence of humans and nature is important for the sustainability of the Earth.

Humans and nature should coexist.

The opposition party is making harsh criticisms against the government's policies.

He is an enrolled student at the University of Tokyo.

My friend is living in Argentina as a resident.

My brother resides in Argentina.

He is studying the life of staying in the old days.