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You can use V-ing when you use "present continous" ( Thì hiện tại tiếp diễn):
"S + be + V-ing"
Ex: I'm reading
You can use V-ed when you use "Past tense" ( Thì quá khứ)..but I note you that...not all words use "-ed"....some words are irregular verbs ( Động từ bất quy tắc)
For example: I called you ( S + V-ed + O) [ is it right :-/ ]
I forgot something (S + V2 + O)
And last one , You can use V when you use "Simple tense" ( Thì hiện tại đơn)...This tense is very basic....when you start to study English....you will learn that first !