语法 Where is she?where是作表语吗?请分析下,

"主系表"结构where当然作的是表语,LZ听说过"主系状"结构吗?where 在这此句中作表语无需质疑
常见的疑问副词when,where,why ,how 及how短语,它们在句中作状语,表语等成分.
a.作表语
(1)When is your birthday?(when指时间,作表语)
--It is July 6th.
(2)Where is my book?(where指地点,作表语).
---It is under the desk.
(3)How old is your brother?(how old 指年龄,作表语)
---He is eleven.
(4)How are you?(how 指状况,作表语)
--I am fine.
b.作状语
(1)When do you get up in the morning?(when指时间,when=what time作状语.)
----I get up at six.
(2)Where can I find your house?(where指地点,作状语)
---You can find it near our school.
(3)Why are you so sad?(why 指原因作状语)
---Because I miss my friend.
(4)How do you come to school?(how指方式,作状语)
--I come to school by bike.
(5)How long can I keep this book?(how long 指一段时间,作状语)
----You cam keep it for a week.
(6)How often do you go home?( how often 择时频率,作状语)
--I go home once a week.
注:形容词,名词,代词作表语是比较常见的
但是数词、动词的分词或动名词或不定式形式、地点和状态副词、介词短语、（表语）从句也可以作表语.
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