cubeFollow.cs

using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.Windows.Speech;


public class cubeFollow : MonoBehaviour {

    private string mode = "none";

    // Use this for initialization
    KeywordRecognizer keywordRecognizer = null;
    Dictionary<string, System.Action> keywords = new Dictionary<string, System.Action>();

    // Use this for initialization
    void Start()
    {
        keywords.Add("bigger", () => {
            mode = "grow";
        });
        keywords.Add("smaller", () => {
            mode = "shrink";
        });
        keywords.Add("stop", () => {
            mode = "none";
        });
        keywords.Add("pick up", () => {
            mode = "follow";
        });
        keywords.Add("place", () => {
            mode = "none";
        });

        // Tell the KeywordRecognizer about our keywords.
        keywordRecognizer = new KeywordRecognizer(keywords.Keys.ToArray());

        // Register a callback for the KeywordRecognizer and start recognizing!
        keywordRecognizer.OnPhraseRecognized += KeywordRecognizer_OnPhraseRecognized;
        keywordRecognizer.Start();
    }

    private void KeywordRecognizer_OnPhraseRecognized(PhraseRecognizedEventArgs args)
    {
        System.Action keywordAction;
        if (keywords.TryGetValue(args.text, out keywordAction))
        {
            keywordAction.Invoke();
        }
    }

    // Update is called once per frame
    void Update () {
        switch(mode) {
            case "follow": 
                transform.position = Camera.main.transform.position + Camera.main.transform.forward * 5;
                break;
            case "grow":
                transform.localScale *= 1.01f;
                break;
            case "shrink":
                transform.localScale *= 0.99f;
                break;                
        } 	
    }	
}