He is researching about a new energy source.

Let's play outside.

There is no one else but me.

He likes to learn foreign languages.

He is a foreigner, so he finds it difficult to learn about Japanese culture.

He is playing outside.

In addition to keys and wallets, there are many small items in my bag to take outside.

He is playing outside.

He is playing outside the house.

He is deeply interested in Buddhist teachings, but he is open to learning non-Buddhist teachings as well.