Mine actually differs by situation and personality of the sub
For lighter spirited subs, Yang Xiao-Long, a personal favorite, for example, simple acceptance of the dom being their Master/Mistress, but retaining their normal personality otherwise. She's still allowed to make puns, playfully jab at her Master, etc. But she fully accepts that no - HE is in control. Even to the point that he could tell her to do something she really doesn't want to, she'd do it, then pout about it.
For women with bitchier personalities, such as Raven of Titans fame, being forced to affirm they're... less than pleasant.
"I'm a bad girl" "I'm such a horny little bitch" etc. Also, for these types I tend to find the dom being referred to as "daddy" to work better. More demeaning for the sub, I feel. "I'll be a good girl for you, daddy"
Girls with politer demeanors, like Pyra from Xenoblade since I just played that, more of a loving relationship with lighter dialogue. Maybe she calls him Master, maybe not. Could go either way. But her dialogue would be more loving and tender. "Welcome home, hon" kind of things.
HOWEVER one that crosses over for me and really drives me crazy is rhyming mantras.
"The watch will sway and I'll obey", "I live to do my Master's will, his every wish I shall fulfill", stuff of that nature.