Conjugation of the verb होना = (hona) = to be, to become, to happen. ho = हो = present, second person plural, used with तुम hoon = हूं = present, first person singular, used with मैं hue = हुए = preterite, present and past perfect, 1st, 2nd, 3rd person plural with हम, तुम , आप, वे,ये (and in combination with one of the forms of hai = है) ref:(http://www.verbix.com/webverbix/go.php?D1=47=honaa=147)

ho हो = तुम क्या कर रहा हो ( What are u doing ? ) Hoon हूँ = मै आज बहुत ख़ुश हूँ ( i am so happy today.) Hue हुए = मेरी उपस्थिति मे, बहुत से कार्य हुए