Sentence types and word order

English sentences belong to four types by purpose: a declarative sentence makes a statement and ends with a full stop (She lives in Baku.); an interrogative sentence asks a question and ends with a question mark (Where do you live?); an imperative sentence gives a command or request and usually begins with the base verb (Close the door, please.); and an exclamatory sentence shows strong feeling (What a beautiful day!). To make yes/no questions we put the auxiliary or 'be' before the subject (Do you like tea? Is she ready? Can he swim?), and wh-questions follow the pattern Wh-word + auxiliary + subject + verb (Where do you live?). When the question word is the subject, we keep normal order and use no extra auxiliary (Who came late?). The basic word order of a statement is Subject + Verb + Object; adverbs of frequency such as always, never and often go before the main verb but after 'be' (She always works hard; She is always late). We also use 'There is/There are' to say that something exists and the impersonal 'It' for weather, time and general statements. For example: 'There is a book on the desk, and it is very interesting.'