यूनिवर्सिटी ऑफ़ मिशिगन
Second person singular.
(adapted from Chapter One of  Hindi Structures.)
      In addition to the formal  आप and the informal  तुम,  Hindi possesses a third second person pronoun, namely the intimate  तू.  Its forms are parallel to those of   मैं:

1a.	Oblique:	वह मुझ से मिलेगा।	वह तुझ से मिलेगा।
1b.	Special dative:	वे मुझे पैसे देंगे।	वे तुझे पैसे देंगे।
1c.	Possessive:	यह मेरा घर है।	वह तेरा घर है।

      Except in the imperative, verbs agreeing with  तू  have forms indistinguishable from those of those of the third person singular:

2a.	लड़का कपड़े कब लाएगा ?	तू कपड़े कब लाएगा ?
2b.	क्या लड़की पत्र लिख रही है ?	क्या तू पत्र लिख रही है ?
2c.	वह जल्दी पहुँचा।	तू जल्दी पहुँचा।
2d.	अगर वह चली जाए तो अच्छा है।	अगर तू चली जाए तो अच्छा है।

In the imperative,  तू takes the bare stem:

3a.	मेरा हाथ मत देख !	Don't look at my hand!
3b.	यहाँ से निकल जा !	Get out of here!
3c.	आ,  बेटे,  यहीं बैठ !	Come, child.  Sit right here!

The plural of  तू is  तुम :

4a.	अरे कुत्ते,  हट !	Get back, Dog!
4b.	अरे कुत्तो ( कुत्तों ),  हटो !	Get back, Dogs!

      तू  is used when addressing those with whom one is at no social distance: animals, babies, lovers, God, and one's own self in mental soliloquy.  As social outsiders, visitors to India or Pakistan have little occasion to use  तू (except, perhaps, when shooing dogs).  But in certain situations  तू will be frequently heard.  In some families parents address their children with it and the children may reciprocate, at least with the mother.  Some husbands use  तू with their wives and at least the non-traditional wife may respond in kind.  However, there is a tendency to use  तू less in front of outsiders as a sign of respect to them.  Urban speakers of Hindi tend to replace it with  तुम and may deny using  तू altogether.
  5.   तुम तू-तड़ाक से मत बोलो।  बुरा लगता है।
        'Don't use  तू .  It sounds bad.'
Exercise.
To index of grammatical notes.
To index of मल्हार.
Keyed in and posted 5-6 Sept 2001.