I think it is present perfect.
1)help your parents
2) do your homework that given by your teachers
3) going to the tuition class
Causing to feel pity, because the person comforted the cat due to feeling bad for the cat.
Greetings!
There are numerous examples for this question:
One example could be...
When you spend hours studying for a test, in order to obtain a high mark.
Hope this helps.
-Benjamin
