when talking to a male: teh-chah-yech. Hashem ohev otcha.
(תחייך, ה׳ ×והב ×ותך)
when talking to a female: teh-chah-y'chi. Hashem ohev otach.
(תחייך, ה׳ ×והב ×ותך)
(The "ch" is a gutteral sound. If you pronounce it like the ch
in chew, you won't be understood).