I have two methods, generateNounPhrase() and generateVerbPhrase(). VerbPhrase will call on NounPhrase half the time and it's output the output should be something to the effect of:

the empty lot re-animates this pyramid

(bold indicating where generateNounPhrase() is logically called). The true output however is in the form of:

the empty lot re-animates the empty lot

At first I thought my randomIndex method wasn't working as I had intended, but if I run the two methods again I do get different noun phrases but they are not unique at the beginning and end of the sentence as they should be.

Any idea what I am doing wrong in order to get one method to show the same result?

private string generateNounPhrase()
{
    string nounPhraseString = "";
    nounPhraseString = nounMarkersStringList[randomIndex(0,nounMarkersStringList.Count-1)];
    if (included(1, 4, 2) == true)
    {
        nounPhraseString += " " + adjectivesStringList[randomIndex(0, adjectivesStringList.Count - 1)];
    }
    nounPhraseString += " " + nounsStringList[randomIndex(0, nounsStringList.Count - 1)];
    return nounPhraseString;
}

private string generateVerbPhrase()
{
    string verbPhraseString = "";
    if (included(1, 4, 2) == true)
    {
        verbPhraseString = intransitiveVerbsStringList[randomIndex(0, intransitiveVerbsStringList.Count - 1)];
    }
    else
    {
        verbPhraseString = transitiveVerbsStringList[randomIndex(0, transitiveVerbsStringList.Count - 1)] + " " + generateNounPhrase();
    }
    return verbPhraseString;
}