Consider the sentence: We test whether the underlined string is a constituent by replacing it with a single word, as in: "Lowen bought a scarf [ Select ] there then did so it ". This single word is not just any word, but the term we use to refer to such a word is [ Select ] enclitic pronoun antecedent pro-form This is an example of a [ Select ] Omission Reduction Movement Segment fragment Substitution test. Let's say the resulting [ Select ] paragraph utterance sentence question is grammatical. This gives us evidence that the target string [ Select ] is is not a constituent in original sentence.多重下拉选择题