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

I am busy with work during the daytime.

My keys are inside the house.

There are many arguments arising from diverse opinions about that issue, and no conclusion has been reached.

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 the house.

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

He is playing outside.

She is planning a date with her current boyfriend.