The imperative mood (abbreviated IMP) expresses commands or requests as a grammatical mood. These commands or requests urge the audience to act a certain way. It also may signal a prohibition, permission, or any other kind of exhortation.

Formulation of the English imperative simply uses the bare infinitive form of the verb. The infinitive form usually corresponds to the second-person present indicative form, with the exception of the verb be. The subject of these sentences is usually understood as you (the second person) except in the case of "Let's" which implies first person and at least a second person. Other languages such as Latin, French and German have several inflected imperative forms, which can vary according to grammatical categories such as:

For instance, Latin regular forms can exist:

Some consider this richness of forms useful for a better understanding, particularly because no subject pronoun normally specifies with the imperative.

The use of the imperative mood be seen as impolite, inappropriate or even offensive in certain circumstances. Commonly, polite speech will instead express the same thing as a question or statement, such as:

David Luiz Moreira Marinho (born 22 April 1987), known as David Luiz, is a Brazilian footballer who plays for Chelsea in the Premier League. Primarily a central defender, he can also be deployed as a left back.

After starting out at Vitória, he moved to Benfica at the age of 19, remaining with the club five seasons (three complete). He joined Chelsea in January 2011, winning the Champions League and the FA Cup in the following season.

Born in Diadema, São Paulo, David Luiz arrived in Esporte Clube Vitória at the age of 14 after being released by São Paulo FC, and started playing as a defensive midfielder, almost leaving the club for his poor performances in that position. However, he was soon moved to central defender and adapted well.

Luiz made his official debut for Vitória in 2006, and excelled against Santa Cruz Futebol Clube for that season's Brazilian Cup, in a 2–2 draw. At the worst situation of its history, in the third division, Vitória promoted to the second division at the end of the season with Luiz's help, after finishing in second position, with the central appearing in eight of the club's last decisive nine games, scoring his only Série C goal on 3 September 2006, in a 2–0 home win against Clube Atlético do Porto.

Stephen William Hawking, CH, CBE, FRS, FRSA (born 8 January 1942) is a British theoretical physicist, cosmologist, and author. His key scientific works to date have included providing, with Roger Penrose, theorems regarding gravitational singularities in the framework of general relativity, and the theoretical prediction that black holes should emit radiation, which is today known as Hawking radiation (or sometimes as Bekenstein–Hawking radiation).

He is an Honorary Fellow of the Royal Society of Arts, a lifetime member of the Pontifical Academy of Sciences, and in 2009 was awarded the Presidential Medal of Freedom, the highest civilian award in the United States. Hawking was the Lucasian Professor of Mathematics at the University of Cambridge between 1979 and 2009. Subsequently, he became research director at the university's Centre for Theoretical Cosmology.

Hawking has a motor neurone disease related to amyotrophic lateral sclerosis, a condition that has progressed over the years. He is now almost completely paralysed and communicates through a speech generating device. He has been married twice and has three children. Hawking has achieved success with works of popular science in which he discusses his own theories and cosmology in general; these include A Brief History of Time, which stayed on the British Sunday Times best-sellers list for a record-breaking 237 weeks.