This technology has not yet been made practical or useful.

There are still many challenges left to put this technology into practical use.

I have to finish the assignment quickly.

He spends a lot of time studying.

He reads a lot of books.

My homework is not finished yet.

My homework is still unfinished.

He was helping the villagers as a wizard.

I haven't done my homework yet.

He decided to remain until the end.