【正确答案】正确答案：It is an utterance by which a speaker expresses a proposition which may be true or false. 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. Sentences like this are called constatives.

【答案解析】解析：(考查叙事句)