public IPostStatementBuilder Verb(Verb value)
        {
            _jobject["verb"] = new JObject(
                new JProperty("id", "http://adlnet.gov/expapi/verbs/completed"),
                new JProperty("display")
            );

            _jobject["verb"]["display"] = new JObject(new JProperty("en-US", "completed"));

            return this;
        }
 IStatementBuilder IStatementBuilder.Verb(Verb value)
 {
     _parameters["verb"] = value.Display.First().Value;
     return this;
 }