ת.נ.א. list.

Question 1

והא תניא

Answer 1

*But it is taught*

Introduces a tannaitic text as the source of an objection.

Question 2

והאנן… תנן

Answer 2

*But haven’t we learned… (in our mishnah)?*

Introduces a contradiction between a mishnah (usually the one currently under discussion) and a source/halakhah that has just been cited; the relevant part of the mishnah will be cited after or inbetween.