Abstract:
* "Agreement" can refer to the *concept* of being in accord or harmony. In this sense, it's abstract because it's not a tangible object.
* Example: "They reached an agreement on the terms of the contract." (Here, "agreement" represents the concept of coming to a mutual understanding.)
Singular:
* "Agreement" can also refer to a specific instance of reaching accord, like a written contract. In this case, it's singular because it refers to one particular agreement.
* Example: "The agreement was signed by both parties." (Here, "agreement" refers to a specific document.)
To determine whether "agreement" is abstract or singular in a specific context, consider the following:
* Does it refer to a general concept or a specific instance?
* Is it something you can physically hold or is it an idea?
By analyzing the context, you can determine whether "agreement" is being used in an abstract or singular sense.