Concepts of Verb Tense
English tenses are used to express two concepts.
The first is the concept of time, which can be:
fixed points in time,
periods of time – duration,
indefinite time, where only past, present, or future is important. Perfect tenses are used to relate such time periods.
The second is the concept of aspect, which refers to
Situations in which an action or event occurs in a time frame, in which an additional function needs to be expressed.
This marriage of time and function allows greater clarity to be conveyed without using additional words.
Part A. The Simple Present Tense
Part B. The Present Continuous Tense
Part C. Non-action Verbs
Part D. The Present Perfect Tense
Part E. Choosing between Present Perfect and Simple Past
Part F. The Present Perfect Continuous Tense
Part G. The Simple Past Tense
Part I. Future in the Past
Part H. Past Continuous or Simple Past
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