3rd tone runs

[Apollys]

Yes, I used to do that frequently when I first started learning, now I can trust my ears pretty well (but still use it from time to time).

[Flickserve]

Yes, I used to do that frequently when I first started learning, now I can trust my ears pretty well (but still use it from time to time).

Excellent.

Then all you have to do is take a sample size of about twenty to thirty native speakers, get each one to speak your sample sentences and analyse how many follow the rule and how many don't.

Now you have your own descriptive statistics for native speakers on tone sandhi.

[陳德聰]

A question inspired by Yuliyyya's post: I'm wondering if you guys have any insight into the pronunciation of 好好 as 33 (23) vs 35, I've always heard it as 35 so far, but I've seen it written as 33 also.

It is 31 when it means "properly", 35 seems fine, but 33 combo is definitely "wrong" if you are looking for "standard" Mandarin.