1why was the letter sent to the wrong address?
——原句：The letter was sent to the wrong address.
特殊疑问句对原因进行提问要用 why 把was提前.
句义：为什么信被送到了这个错误的地址?
2A garage is a place where car is repaired.
句义：车库是汽车被修理的地方.意义一下就是：车库是修车的地方.
where car is repaired做place的定语 ,车被修理是被动形式而不是自己能主动的动作,所以用被动形式.