1 Radford,A., "Transformational Grammar" Cambridge UP 1988
2 Chomsky,N., "The Minimalist Program" MIT Press 1995
3 Palmer, F. R., "The English Verb" Longman 1989
4 Akmajian, Steel, "The Category Aux in Universal Grammar" 22 : 1979
5 Hinrichs, E., "Tense, Quantifiers and Context" 14 (14): 2-14, 1988
6 Rivere, Claude, "Tense, Aspect, and Time Location" 18 : 105-135, 1980
7 Henry, F., "Tense, Aspect, and Time Adverbials, Ⅱ" 5 (5): 109-154, 1982
8 Richards, B., "Tense, Aspect, and Time Adverbials, Ⅰ" 5 (5): 59-145, 1982
9 Giorgi, A, "Tense and Aspect:From Semantics to Morphosyntax" Oxford UP 1997
10 Dahl,O., "Tense and Aspect Systems" Blackwell 1985
1 Radford,A., "Transformational Grammar" Cambridge UP 1988
2 Chomsky,N., "The Minimalist Program" MIT Press 1995
3 Palmer, F. R., "The English Verb" Longman 1989
4 Akmajian, Steel, "The Category Aux in Universal Grammar" 22 : 1979
5 Hinrichs, E., "Tense, Quantifiers and Context" 14 (14): 2-14, 1988
6 Rivere, Claude, "Tense, Aspect, and Time Location" 18 : 105-135, 1980
7 Henry, F., "Tense, Aspect, and Time Adverbials, Ⅱ" 5 (5): 109-154, 1982
8 Richards, B., "Tense, Aspect, and Time Adverbials, Ⅰ" 5 (5): 59-145, 1982
9 Giorgi, A, "Tense and Aspect:From Semantics to Morphosyntax" Oxford UP 1997
10 Dahl,O., "Tense and Aspect Systems" Blackwell 1985
11 Radford,A, "Syntactic Theory and the Structure of English" Cambridge UP 1997
12 Jackendoff, "Semantic Interpretation in Generative Grammar" MIT Press 1972
13 Huddleston,R., "Introduction to the Grammar of English" Cambridge UP 1984
14 Bas Aarts, "English Syntax and Argumentation" Palgrave 2001
15 Quirk, R., "Comprehensive Grammar of The English Language" Longman Group Ltd 1985
16 Chomsky,N., "Aspect of Theory of Syntax,Cambridge" M.I.T Press 1965
17 Gillian,C.R., "Aspect and Predication" Clarendon Press 1997
18 Comrie,B, "Aspect" Cambridge UP 1976
19 Verkuyl,J., "A Theory of Aspectuality" Cambridge UP 1993
20 Palmer, F. R., "A Linguistic Study of English Verb" Longman 1965