Question

i want to help me by a definition of length mass time and charge

Answer 1

length-a measure of distance, generally in the horizontally direction of a front facing plane
mass-[anything that takes up space] in the broader sense, mass includes mass-energy (from the law of conservation of mass-energy: see Einstein's work)
Time is harder to encapsulate into a definition but the dictionary lists it as "the system of those sequential relations that any event has to any other, as past, present, or future; indefinite and continuous duration regarded as that in which events succeed one another" (Dictionary.com).
Charge-"one of the basic properties of the elementary particles of matter giving rise to all electric and magnetic forces and interactions. The two kinds of charge are given negative and positive algebraic signs: measured in coulombs" (Dictionary.com)