are almost always dropped in imperative sentences (e.g., Come here! Do tell! Eat your vegetables!), with the subject "you" understood or communicated non-verbally. In informal speech, the pronominal subject is sometimes dropped. The ellipsis has been called "conversational deletion" and "left-edge deletion", and is common in informal spoken English as well as certain registers of written English, notably diaries. Most commonly, it is the first person singular subject which is dropped. Some other words, especially copulas and auxiliaries, can also be dropped. [Have you] ever been there? [I'm] going shopping. [Do you] want to come? [I] haven't been there yet. [I'm] going later. Seen on signs: [I am/We are] out to lunch; [I/we will be] back at 1:00 [P.M]. What do you think [of it]? – I like [it]! (the latter only in some dialects and registers) [Do you] want a piece of cake? [You] are not! – [I] am too! This pattern is also common with other tenses (e.g., were, will) and verbs (e.g., do/did, have/had). In speech, when pronouns are not dropped, they are more often reduced than other words in an utterance. Relative pronouns, provided they are not the subject, are often dropped in short restrictive clauses: That's the man [whom] I saw. The dropping of pronouns is generally restricted to very informal speech and certain fixed expressions, and the rules for their use are complex and vary among dialects and registers. A noted instance was the "lived the dream" section of George H. W. Bush's speech at the 1988 Republican National Convention. Other language families and linguistic regions Among the Indo-European and Dravidian languages of India, pro-drop is the general rule though many Dravidian languages do not have overt verbal markers to indicate pronominal subjects. Mongolic languages are similar in this respect to Dravidian languages, and all Paleosiberian languages are rigidly pro-drop. Outside of northern Europe, most Niger–Congo languages, Khoisan languages of Southern Africa and Austronesian languages of the Western Pacific, pro-drop is the usual pattern in almost all linguistic regions of the world. In many non-pro-drop Niger–Congo or Austronesian languages, like Igbo, Samoan and Fijian, however, subject pronouns do not occur in the same position as a nominal subject and are obligatory, even when the latter is present. In more easterly Austronesian languages, like Rapa Nui and Hawaiian, subject pronouns are often omitted even though no other subject morphemes exist. Pama–Nyungan languages of Australia also