Declarative and exclamatory are two types of sentences. As an English student, you will know by now that sentences can be of several different types.
An exclamatory sentence is self-explanatory: these sentences end with exclamation marks, which means that they express strong emotion of some kind. Here is an example of an exclamatory sentence: "I am fed up with the rain!" A declarative sentence is a statement and will end in a full stop. This is an example of a declarative sentence: "It has been raining now for ten days straight." An interrogative sentence is a question and this type of sentence will end in a question mark. Here is an example: "Can you remember the last day that it didn't rain?" Finally, you should be able to recognise an imperative or a command. These always include an imperative verb, which is often placed at the beginning of the sentence. Here the verb is "shut": "Shut the window before the curtains get wet!" Commands can end in full stops or exclamation marks depending on how urgent the instruction is. Be careful not to confuse them with exclamatory sentences.
See if you can you identify the type of sentence for each of the following. If you get all 10 correct, you're on your way to understanding types of sentences!