thanks,Ashley

"Pretty" can be use an adverb, but I wouldn't use it as a substitute for "very." "Very" emphasizes the adjective or noun, whereas "pretty" deemphasizes the adjective or noun. On a scale of one to five, a "pretty good" movie would be between a 3 and a 4 while a "very good" movie would be between a 4 and a 5 (a "good" movie would be a 4). I also wouldn't substitute "too" for very because "too" suggests something negative. Being "too pretty" or "too fast" implies that something is wrong and you need to reduce something. Hope this helps.

thank you :)

Hello(: I'm not an expert in English, but I've heard about this expression very often, and I think You're right. It's very common to used ''pretty'' instead of ''very'' or ''too'' I hope I've been helpful.