Use of Dakten change pronouciation

 Dakuten and handakuten is Japanese marker that indicates how to pronounce the alphabet.

Dakuten on the right corner of Ka pronounced as Ga.

As same 

ぎ Pronounced as Gi

ぐ pronounced as Gu

げ pronounced as Ge

ご Pronounced as Go

Dakuten on the right corner of さ, sa pronounced as ざ za.

As same 

じ Ji

ず Ju

ぜ Je

ぞ Jo

For the use of dakuten T pronounced as d

た ta become だ da