If someone learns the simple translation of each word in davening each day. Can he still do it on Tisha Bi'Av?
It is either considered learning or not.
If it is considered learning then you can't do it.
If it is not considered learning that you can do it.
Other prohibitions include...Learning Torah, since this is a joyful activity. It is permitted to learn texts relevant to Tisha B'Av and mourning -- e.g. the Book of Lamentations, Book of Job, parts of Tractate Moed Katan, Gittin 56-58, Sanhedrin 104, Yerushalmi end of Ta'anis, and the Laws of Mourning. In-depth study should be avoided. (MB 554:4)
So is it considered learning Torah?