A Study On The Different Tense Of Unrealistic Category In The View Of Logic

In this paper,I study the Unrealistic category,and make a preliminary summary of the criterion,semantic classification and syntactic realization of the unrealistic sentences.Through the study,I find that there are differences in the syntactic expressions of the unrealistic and the realistic categories for the tense.Embodied in the following three aspects:Part 1: the use of tense markers in the sentences of realistic categories is necessary.The collocation of lexical and grammatical markers is limited.In a unrealistic sentence,the tense marker can be used or not used.There is no restriction on the collocation of the two markers.Part 2: in the realistic categories,there is strict restrictions on the use of "?" and "?",while in the unrealistic category,there is no strict restrictions on the use of "?" and "?".Part 3: the form of overlapping forms of verb can only appear in the special realistic sentence,which is to express the meanings of the habit and so on,while the use of overlapping forms in unrealistic sentences is unlimited.Moreover,I find that a lot of verb overlapping forms of verb contain an unrealistic meaning.At last,this paper tries to explain the syntactic differentials from the perspective of logic.