6.2. The main usage of the progressive form 6.2.1. The time representation of the progressive form The progressive form often expresses a duration. See the following figures. (3) a. Present progressive form b. Past progressive form c. Future progressive form M is put at the future in (3c), because the progressive form uses "will" or "shall," it is called the far future in this text. Now, another time line is put on each time representation. It is put on E as a center and means the duration.

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