Identify the type of sentence: 'Please close the door.' Also explain the four types of sentences. (NCERT English Grammar – Important)

Answer: 'Please close the door.' is an imperative sentence because it gives a command/request. Four types of sentences by purpose: (1) Declarative/Assertive—states a fact or opinion (e.g., 'The sky is blue.'); (2) Interrogative—asks a question (e.g., 'Where are you going?'); (3) Imperative—gives order/request/advice (e.g., 'Sit down.'); (4) Exclamatory—expresses strong emotion (e.g., 'What a beautiful day!').