What to say and When to say it.

1. Starting to do something - Say BIS-MILLAH
2. Intending do do something - INSHA-ALLAH
3. Something is being praised - SUBHAAN-ALLAH
4. In pain and distress - YA-ALLAH
5. Expressing appreciation - MASHA-ALLAH
6. Thanking someone - JAZAK-ALLAH
7. Awakening from sleep - LA-ILAHA-ILL ALLAH
8. Taking an oath - WALLAH-BILLAH
9. Sneezing - ALHAMDO-LILLAH
10. Someone else sneezes - YAR-HAMOK-ALLAH
11. Repenting for a sin - ASTAGH-FERULAH
12. Giving charity - FI-SABI-LILLAH
13. Having love for someone - LIHUB-BULLAH
14. Getting married - AMAN-TO-BILLAH
15. Parting from someone - FI-AMAAN ALLAH
16. Problems appear - TAWAK-KALTO-AL-ALLAH
17. Unpleasantness appears - NA-UZO-BILLAH
18. Pleasantness appears - FATA-BARAK-ALLAH
19. Participating in prayer - AMEEN
20. Death message is recieved - INNA-LILLAHI-WA INNA-ILAIHI-RAJI-UN

 Source : islamicpostings