The verb 'read' is spelled the same in the present and the past. It is pronounced 'reed' in the present and 'red' in the past. Maybe that is what is confusing you.
Note also that only the present ever adds "s" to the verb, and the word "books" refers to more than one book and does not change at all.
Present ("reed"): I read books; you read books; we read books; they read bo