We are playing in the realm of possessive phrases and participles.
First, let us get some background noise out of the way ...
Background noise:
Possessive phrase:
I have a ball.
I have eaten breakfast.
In such a possessive phrase
I possess {a possessed concept}
Where the possessed concept could be
In less than precise description, a participle is a verb or verb phrase that is structured in such a way that it is able to function
- in place of a noun
- as an adverb/adjective
Example of participles in action "Yesterday, I was/had {a concept}":
- Yesterday, I was {a bird}. /* not a participle, just for comparison */
- Yesterday, I was {eating}.
- Yesterday, I was {eaten}.
- Yesterday, I had {eaten}.
Explanation
The struggle you have is between
- I played football for Manchester Utd.
- I have played football for Manchester Utd.
The second sentence is a possessive phrase. The first sentence says that I performed an action. The 2nd sentence says I possess the experience of an action.
Let us compare the following:
- Yesterday, we represented Westbrook High School.
- Yesterday, I could say, we had represented Westbrook High School. Yes, by yesterday, we possess the experience of representing Westbrook High School. In fact, by yesterday, we had represented Westbrook High School for two seasons.
Confusion of have
The verb "have" is frequently confused between its possessive and alternative usages. I have a hypotheses why confusion occurs, as exemplified by the following. People seem to be confused by the proliferation of "have", "have had", ...
- I had breakfast.
- I have had breakfast.
- We had the opportunity of representing Westbrook High School.
- We have had the opportunity of representing Westbrook High School.
In the first sentence, "have" is used in place of "eat".
{I had breakfast} = {I ate breakfast}
In the 2nd sentence are two different uses of "have". First as a possessive verb, and 2nd, used in place of "eat".
{I have had breakfast} = {I have eaten breakfast}
In the 3rd sentence, it says
We took the opportunity. We possessed the opportunity.
In the 4th sentence, it says
We have taken the opportunity. We possess the experience of taking the opportunity.
In conclusion
The following sentence is used exactly and precisely.
On January 17th, we represented Westbrook High School at the Maine track and field.
The following sentence bears an uncomfortable hint of imprecision. Colloquially speaking, it is a widely used form to project emphasis. People tend to accept that throwing in more words to an action would place emphasis on that action.
On January 17th, we had represented Westbrook High School at the Maine track and field.
It says that on On January 17th, we possessed the experience of representing Westbrook High School at the Maine track and field - not necessarily that we actually did represent Westbrook High School on January 17th itself.
The sentence would feel more complete in one of the following ways.
- On January 17th, we could say, we had represented Westbrook High School at the Maine track and field. On the day after our last event, we had the pleasure of realizing that we had represented Westbrook High School.
- By January 17th, we had represented Westbrook High School at the Maine track and field on numerous occasions.
- After January 17th, we had represented Westbrook High School at the Maine track and field on numerous occasions.