Select all sentences in which the perfect form matches the stated focus.
I have been reading all afternoon and still have forty pages left.✓Respuesta correcta
She has completed seven registration forms so far.✓Respuesta correcta
We have been completing seven registration forms so far, and all seven are filed.
His shoes are muddy because he has been walking across the fields.✓Respuesta correcta
She has painted the gate all morning and is still only halfway through it.
Explicación
The reading sentence foregrounds continuing duration, the forms sentence counts completed results, and the muddy-shoes sentence explains present evidence of activity. The rejected forms mismatch a finished count or an explicitly unfinished duration.