Now identify the simple subject and simple predicate . the meeting began promptly at seven o'clock .

The simple subject of this sentence is "Meeting" and the simple predicate of this sentence is "began"

Explanation:

All sentences are made with two main parts which are subject and predicate. The simple subject is the main word of the full subject, it is always a noun or a pronoun, then from the full subject "The meeting" the main word is "meeting". The simple predicate is the complete verb without the other words of the full predicate, then "began promptly at seven o'clock ." is the full predicate and the full verb is "began".

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.