Sentences are often classified according to their purpose. There are four purposes that sentences may have: There are four purposes that sentences may have: to make a statement, to give an order or make a request, to ask a question, and to express strong emotion.
Declarative Sentence: This sentence makes a statement. EG ‘Andrew moved to Miami.’ ‘He has lived there since January.’ A declarative sentence usually ends with a period but can end with an exclamation mark. This type of sentence is the most frequently used in speaking and writing.
Imperative Sentence: This sentence gives a command or makes a request. ‘Write me a letter.’ ‘Andrew, please send your address.’ An inperative sentence usually ends with a period but can end with an exclamation mark. In imperative sentences, the subject you is understood.
Interrogative Sentence: This sentence asks a question. ‘Do you like the weather?’ ‘What do you do after work?’ An interrogative sentence usually ends with a question mark but can end with an exclamation mark if it expresses strong emotion.
Exclamatory Sentence: This sentence expresses strong emotion. ‘I can’t believe you moved!’ ‘Call me soon!’ ‘What were you thinking!’ An exclamatory sentence ends with an exclamation mark.
Note that sentences are not exclusively exclamatory but can be declarative (first example), imperative (second example), or interrogative (third example) while expressing strong emotion. In writing, exclamatory sentences should be used sparingly so as not to detract from their effectiveness.