<Li> Lord Speaker <Ul> <Li> The Lord Fowler </Li> </Ul> </Li> <Ul> <Li> The Lord Fowler </Li> </Ul> <Li> The Lord Fowler </Li> <Ul> <Li> Speaker <Ul> <Li> John Bercow </Li> </Ul> </Li> <Li> Leader of the Opposition <Ul> <Li> Jeremy Corbyn </Li> </Ul> </Li> </Ul>

What does the speaker do in the house of commons