On That "Le_2" Does not Occur Alone in a Sentence

To understand the grammatical meanings and functions of le1 and le2 correctly,we must discern the complex correlations between le1,le2 and the situation aspects of sentences; using the meaning of realization of le1 and the function of emphasizing now time point of le2 ,we may discern the mess of syntactic positions of le1 and le2 ,especially the situation that le1 and le2 are combined into one word at the end of a sentence,thus we may draw the conclusion that le2 does not occur alone without le1 in a sentence,which could be helpful to the identifying of le1 and le2 ,and to a better understanding of the grammatical meanings and functions of le1 and le2.