1 and 2 seem kind of std but obv on the spewy side. in 2 id imagine u would lead the turn almost every time u have a 6 in your hand but he prob isnt a very good handreader.

3 seems like a flop fold and a turn fold

4 id just check for sure. on that board all of his good aces make more money from checkcalling than 3rd barreling and a lot of people will take that line