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1. Continuous progressive.
when we talk about something right now.
Is expressed with a form of be together with the present participle of the verb.
2. Subject - object
the subject usually comes before the verb.
the object usually comes after the verb.
3. After preposition.
as a preposition followed by a noun.
as an adverb without a following noun.
4. Adjective.
They respond as it is.
5.After some verbs:
use the gerund
