Final answer:
The sentence 'When do you want to go to lunch?' is an interrogative sentence because it is formulated as a question seeking information about the timing for lunch.
Step-by-step explanation:
The question “When do you want to go to lunch?” is considered an interrogative sentence. This is because the sentence functions as a question, which is seeking information about a specific time for lunch. In English grammar, sentences can be categorized into various types, namely interrogative, declarative, imperative, and exclamatory.
An interrogative sentence typically ends with a question mark and is designed to elicit information or inquire. In contrast, declarative sentences state facts or opinions, imperative sentences issue commands or requests, and exclamatory sentences express strong emotion.
The verbs in these sentences respectively indicate mood, reflective of the speaker’s intent—indicative for stating facts or asking questions, imperative for giving commands, and subjunctive for expressing wishes or conditions contrary to fact. Given the context – a student discussing the possibility of going to lunch – this is clearly a question about scheduling a time to eat and hence, is classified as interrogative.