1.the desk/table lamp in the master bedroom is broken/ doesn't work.
2.the vacuum cleaner in 8th floor is broken/doesn't work.
(Note:如果是英国口语,vacuum cleaner可以改为hoover)
3.不知到您说的'电梯厅'是什么意思,如果是电梯开门的走廊的话:
one of the lightbulbs outside the lift/elevator in 7th floor is broken,also one of them is broken in the children's room.
4.我假设你说的"煤气的火"是指的厨房用的灶台:
the fire of the gas burner is too weak
(注意不能用big/small,这是典型的汉语错误,这里的“大小”是指强弱,small/big只表示体积)
5.washing maching is leaking