Please check my sentences.
1 As soon as he's quit his previous job, he will find a new one.
2 She cannot ring to her mom until she's gotten a message from her.
3 It's the ninth times I have ridden on a horse.
4 He hasn't come to them since he broke his leg.
5 She hasn't shown her performance since she fell ill.
6 Until the amendments to the Constitution have been implemented, I will not open my business again