В каких случаях нужно ставить слово do?

Do may refer to:
The verb "to do", which may serve as an auxiliary verb
Dō (Way) (道, Tao), a number of spiritual, martial, or aesthetic disciplines
Do (province) or Dao, a political division in Japan, North Korea, South Korea, and ancient China
Do. or ditto marks

In music:
Do (musical note), the first note of the musical scale in solfege
Do (singer) or Dominique van Hulst, a Dutch singer
Do (album), an album by Do
"Do", a song by The White Stripes from the 1999 album The White Stripes
Do (drum), a drum used in Korean ritual music, a type of buk
The Dø, a French/Finish indie pop band.

Do may also be used for:
Do (kana), a mora symbol in Japanese writing
Dō (胴), the torso protector part of Bōgu, kendo armor
Do (surname), the anglicized variation of the Vietnamese surname Đỗ
.do, the country code top-level domain for the Dominican Republic
.do, a pseudo file extension representing an Apache Struts action
Do, a prefix used by Dornier Flugzeugwerke aircraft
Do, the nickname of Marshall Applewhite, the leader of the Heaven's Gate cult
Do, short for hairdo
Do, a party or festive social gathering,[1] British.
GNOME Do, an application launcher for Linux

О. . Понеслась!
В начала вопросительного предложения 'Do you remember this?'
Или после вопросительного слова (Why, when. how...) 'Why do you think so?'
Ещё это ставится перед некоторыми глаголами типа "заниматься"
Заниматься покупками - do the shopping
Дословно: Заниматься гладиньем - do the ironing
и т. д.
И ещё это глагол "делать".
Вроде всё.