Надобно воткнуть some или any в предложение: We can39;t ask him

We cant ask him to do more? Can we do any ourselves?

Some употребляется в утвердительных предложениях.

Any используется в отрицательных и вопросительных предложениях.

He has some letters.   Does he have any letters?

There are some roses in my garden. Are there any roses in my garden?

They have got some books. Have they got any books?

There are many interesting stories in this book. Are there any interesting stories in this book?

There are some rivers in this country. Are there any rivers in this country?