【正确答案】In contrast to performative, sentences like "I pour some liquid into the tube." is a description of what the speaker is doing at the time of speaking. The speaker cannot pour any liquid into a tube by simply uttering these words. He must accompany his words with the actual pouring. Otherwise one can accuse him of making a false statement. The types of utterances which are intended for narration, description, etc., are called constatives.

【答案解析】[解析] 本题考查语言使用中的叙事句的概念，考生也应知道施为句，以及发话行为、行事行为、取效行为、会话含义等概念。