He is standing there.
He is sitting on the chair.
'Sitting' and 'standing' are present Participles working here as an adjective?
And are they subjective complement?
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Participles in English are often used as adjectives (“the living dead”, “a baked ham”), but they are more commonly used as they are here, with to be to create the continuous tense of verbs.
“He sits” — he typically sits; he characteristically sits; he is just now assuming a seated position.
“He is sitting” — at this moment, he is in a seated position.
(To be clear, “progressive” or “continuous“ is not a tense; it is an aspect of a tense, so there is past continuous, present continuous, and so on.)
No. Both are part of the present continuous tense.
They are present participles.
Being a subject complement and being part of the construction of a verb tense are very different.