1) There is a concert on Saturday. I hope you can come.
2) My parents are making dinner at the moment. (correct)
3) I think you like reading.
4) I don’t understand this exercise. (correct)
5) I would like to tell you what i think of Rio Da Janeiro.
Rule : We can’t use state verbs(hope,like,think,hate,hear etc.) in the present continuous tense, we use it in present tense instead.