Do TAs in the US usually grade student responses?
Yes, this is common in the United States.
With the assumption that &quot;Evaluate the answer sheets&quot; means &quot;Grades assignments/projects/exams&quot;
In both my undergrad and graduate studies and personal experience as a TA, assignments/projects/exams were often graded by a TA.
In my experience I've found that a Professor will generally only participate in the grading process when:

The subject is very specialized. i.e. a semester project, or something that aligns with a professors specialty

The amount of student in the class is very low (&lt; 50). Many of my smaller undergraduate classes were graded by professors either exclusively or in conjunction with TAs.


If we look at something like Penn State's School of Science TA Info Page they specifically list grading a a responsibility of a TA. This responsibility along with the prerequisite that the TA either took that class and did well previously or has extensive knowledge of the subject is very common across Universities in the United States.
You also mention that a TA would &quot;prepare presentations, frame questions, do a textbook reading, take small lectures&quot; This can also be true, but varies more between professors than the position as a whole.