1.

Our teacher has such a soft voice that you can hardly hear her.

Our teacher speaks  you can hardly hear her.

2.

My grandparents' furniture is so old that it collapses if you use it.

My grandparents have  it collapses if you use it.

3.

Your boyfriend's nickname is so awful!

Your boyfriend has !

4.

There was such a lot of jealousy among her nephews!

Her nephews of one another!