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whether从句例句
1、whether不算wh-how同类关系词，因为whether只能使用于名词性从句，而其他关系词除了名词性从句之外，还可以作形容词性从句（定语从句）和副词性从句（状语从句），这是whether从句所不具备的。
2、可以这理解定语从句与宾语从句的转换，但这二个从句性质毕竟不一样，但whether从句可以这样理解：
whether he comes or not totally depends on his mood.
可以这样理解：
（the question）whether he comes or not totally depends on his mood.
但这不是先行词加定语从句，而是名词加同位语从句。
就像我们可以用多种方法表达同一个语义一样。
whether在名词性从句中的用法
不是啊。如which,why,when,where就可以用来引导定语从句；when,where等也可引导状语从句。
单词书是什么书
像你列举的predict这种动词后面可以跟wh-从句（how, what, when, where, which, who或why），这种动词还有arrange, calculate, check, choose, debate, determine, discover, discuss, establish, find out, forget, guess, imagine, know, learn, notice, plan, realise, remember, say, see, talk about, think (about), understand, wonder
例：That might explain why he's unhappy.
I couldn't decide which train to catch.
Let's consider how we can solve the problem.
上面提及的动词还可以跟that-从句
例：I decided that I ought to leave.
这些动词除了还可以跟除why以外的wh-从句+to do
例：Did you find out where to go?
注意如果wh-从句中有主语，则不能用to do
例：I can't imagine what he likes about jazz.
有些动词必须在动词后wh-从句前加宾语，这类动词有advise, inform, instruct, teach, warn.
例：She reminded me what (I had) to do.
I told Linda how to get to my house.
动词ask和show通常会在wh-从句前加宾语，但不是必须的。
例：I asked (him) how I could get to the station, and he told me.
以下动词可以跟宾语+wh疑问词+to do
例：She taught me how to play chess.
I showed her where to put her coat.
通常用the way代替how表达路线或意义
例：Go back the way (that/by which) you came. （或不太正式用Go back how you came.）
Have you noticed the way (that/in which) he spins the ball? （或...noticed how he spins...?）
注意不能用'the way how' （比如不能说Go back the way how you came.）
想要表达可能做出的选择时，whether可以作为wh-从句中的一种使用，和if意思相近
例：He couldn't remember whether/if he had turned the computer off.
有些动词可以跟whether+to do来谈论两者或两者以上间的选择，注意if不能跟to do连用，这类动词有choose, consider, debate, determine, discuss, know（用在疑问句和否定句中），think about, wonder（译为说或考虑做出选择时）。其它说话或者考虑做出选择的动词则不能使用改规则，此类动词有ask, conclude, explain, imagine, realise, speculate, think.
例：You have 14 days to decide whether to keep it or not. （不能是...to decide if to keep it or not.）
whether从句和that从句有区别，需注意
例：I didn't know whether the shop was shut. （不知道商店关没关）
I didn't know that the shop was shut. （商店是关的）
正式书写中，wh-从句前可以加as to表示about或concerning的意思，一般常见于whether前
例：Opinion was divided as to whether the findings from the study were representative of the population as a whole. （或者用不太正式的句型...divided whether）
ask that从句虚拟语气
ask 为动词，后可跟that 从句，一般是指同位语从句，解释内容，或跟以wh开头的疑问词，常用which，因为ask为动词，此结构为动宾
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