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Răspuns:

is trying - a temporary current activity

provides - a habitual or long term activity

has experimented - a completed action that occurred at an unspecified time before now

introduced - a completed action or state in the past

(ha)s become - an action that started in the past and is complete in the present

I am going to the market.

Citizens pay taxes.

He has written his papers.

I phoned her.

They have lived there for the past few years.