I am certain there is some reason why he has not returned even at nightfall. 
aɪ æm sɜ˞tʌn ðɛɹ ɪz sʌm ɹizʌn waɪ hi hæz nɑt ɹɪtɜ˞nd ivɪn æt naɪtfɔl. 
 Indian speaks in a very monotone tone with a clear and close-sounding speech in the recording.