对于 what, who, whom, whose, which, when, where, where 等词，假如它们是用于引出特殊疑问句，那自然就叫“疑问词”。如：
Who attended the meeting? 哪个出席了会议？
Whose handwriting is this? 这是哪个的笔迹？
What have we left behind? 大家走后留下什么了？
Which hotel would you suggest? 你看看住哪家旅馆？
When do you plan to take your holiday? 你计划什么时间休假？
Where is the best place to go surfing? 什么地方是冲浪的最好地方？
Why did you absent yourself from class yesterday? 你昨天为何没来上课?
但假如不是引出特殊疑问句呢？它们叫还叫“疑问词”吗？譬如：
I don’t know who attended the meeting.
Do you know whose handwriting this is.
It’s not known what we have left behind.
Please tell us which hotel you would suggest.
He wants to know when you plan to take your holiday.
Can you tell me where the best place to go surfing is.
He asked why you absented yourself from class yesterday.
我感觉这类句子中的 what, who, whom, whose, which, when, where, where 等应该叫连接代词或连接副词，不可以再叫疑问词，由于它们并非疑问句。
非常想听听专家老师的建议，很感谢！
你的理解完全正确。
1. 构成疑问句的what, who, whom, whose, which等为“疑问代词”。当 what、which 和 whose 构成疑问句且作定语时，同样被叫做“疑问代词”（但也有人将它称之为“疑问形容词”）。when, where, where, why 等为“疑问副词”。
2. 构成名词性从句的 what, whatever, who, whoever, whom, whose, which. whichever,whomever 等被称之为“连接代词”。when,where, how, why被称之为“连接副词”。
3. 构成名词性从句的 whether, if （有词义）和 that （无词义）在句中不担当成分，一般被叫做“连词”或“从属连词”。
