The interrogative in apposition without 'of'

Below is sentences with the interrogative in apposition I found in the internet.

pattern #1 the wh-clause in apposition without 'of'
1)We need to analyze the cause why we failed.
2)John raised the question when the money would be collected.
3)The question arose who was to receive him.
4)The key question what caused the leak remains unanswered.
5)Can you give me a general idea when it will be done.
6)I have only a vague notion why she washes for a living.
pattern #2 the whether clause in apposition without 'of'
7)Nobody can be sure of the possibility whether he will show up.
pattern #3 'interrogative + infinitive' in apposition without 'of'
8)Our previous meeting looked at the issue how to increase income.

The above sentences look ungrammatical at least to me.
Are these sentences the quiet thing in the spoken English.
In advance, thank you for your help.