/g/ is a voiced consonant sound.
To make this sound:
Practice the sound /k/ first, then use the voice to say /g/ ....../g/

coat /kəʊt/ - goat /gəʊt/
curl /kɜːrl/ - girl /gɜːrl/
class /klæs/ - glass /glæs/

Go get your mother’s glasses.
/ɡəʊ get jər ˈmʌðər ɡlæsɪz/
Peggy begged to go to the art gallery.
/'pegi begd tə ɡəʊ tə ði ɑːrt ˈɡæləri/
Gloria gives gracious get- togethers.
/ˈɡlɔːriə ɡɪvz ˈɡreɪʃəs get təˈɡeðərz/
Please give me eight gallons of gas.
/pli:z ɡɪv mi eɪt ˈɡælənz əv ɡæz/
Maggie bagged all the groceries.
/'mæɡi bæɡd ɔːl ðə ˈɡrəʊsəriz/