/yad- / यद्

The pronoun base /yad- is one of the tyadAdInAmaH.

/yad- m + /su
→ ya- यॱ + /su by tyadAdInAmaH
→ !**yas यस् m "the one who", "he who"

yo mUsikam akhadat यो मूसिकमखदत् "who ate the mouse"

yo biDalo mUsikam akhadat यो बिडलो मूसिकमखदत् "the cat that ate the mouse"

yo biDalo mUsikam akhadat sa zvetaH यो बिडलो मूसिकमखदत्स श्वेतः "the cat that ate the mouse, it was white"

/yad- m + /zas → !**yAn यान्

/yad- m + /am
→ ya- यॱ + /am by tyadAdInAmaH
→ yam यम् by amipUrvaH

→ !**yam यम् m "the one whom", "he whom"

yam biDAlam akhadat यं बिडालमखदत् "he whom the cat ate", "the one that the cat ate", "the one the cat ate"

yam mUSikam biDAlam akhadat यं मूषिकं बिडालमखदत् "the mouse the cat ate"

yam mUSikam biDAlam akhadat sa zvetaH यं मूषिकं बिडालमखदत्स श्वेतः "the mouse the cat ate, it was white"

!**yasmAt यस्मात् mn "the one from whom"

!**yasmin यस्मिन् mn "the one in whom"

yasmin deze bahvyo kumAryas sa bahukumArIko dezaH यस्मिन्देशे बह्व्यो कुमार्यः स बहुकुमारीको देशः