Reference
Interrogatives part 1
Interrogatives part 1Β
An interrogative is a function word used to ask a question, such as what, which, when, where, who, whom, whose, why and how.
All of the words and phrases listed here cannot be used with γγ―γespecially, those used as subjects, they should always be marked withγγγγ.

γγ¨γγ‘γγis used as a polite form of γγγγγ and γγ¨γγγ, like γγγ‘γγ in Day 1.
You can download a copy of this cheat sheet here,Β