Which phrases in this information about medicare prescription drug coverage are noun phrases?
1. to senior citizens and others
2. everyone with medicare
3. not all medicare drug plans
4. for the “medicare approved” seal on drug discount cards

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2.  Everyone with Medicare and 3. Not all Medicare drug plans.

Explanation: A noun clause is a group of words in a sentence that has the function of a noun (the subject or the object of the sentence). From the given options the ones that are examples of noun phrases are "everyone with Medicare" and "not all Medicare drug plans" because we can see that they act like nouns. The first option represents a verbal phrase and the last option is a prepositional phrase.

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1. the relationship between a pronoun and its antecedent- reference

reference refers to the relationship between mainly pronoun and another unit of grammar- noun phrase or noun.

2. a singular noun naming a collection or group- collective noun.

collective noun refers to the kind of noun which refer to the name of people, thing or anything in collective. for instance bundle of sticks, herein 'bundle' is collective noun.  

3. a modifying clause whose subject and/or verb is implied- elliptical clause

it is a clause in which words are being left out. on the other hand, the missing word is understood due to the logic or pattern of the sentence.  

4. two or more nouns and/or pronouns serving the same grammatical function and followed by a pronoun that references one or all nouns- compound antecedent

compound antecedent refers to which is made up of two or more words which are joined by 'or' or 'and.'

5. an adjective clause introduced by a pronoun- relative clause.

relative clauses are the clauses which begin with the relative pronouns such as when, where, which, that or who. the noun that precedes, relative pronouns identify or define that noun.  

6. the word, phrase, or clause to which a pronoun refers- antecedent.

antecedents refers to the phrases, clauses or words which are replaced with one of the third personal pronouns.