The floor collapsed under him and he fell two stories.

A floor collapsed, and he fell to his death.

Part of the roof was missing and, inside, the floor had collapsed into the basement below.

The first floor had collapsed but has been replaced in recent restoration works by the owners.

Then the floor under them collapsed, plunging to the ground five stories below.

I am afraid that the floor might collapse on the apartment below.

And he is the only one we have left with any knowledge of genetics since the floor collapsed.

But as he reached the door, the floor collapsed.

Well, the floor collapsed when this one opened under it.

Nine people were killed when the floor of a tavern collapsed into the basement.