Learn English – Active voice and passive voice in Present tense and Present Continues tense

This construction is present perfect passive.

When you talk about 'subjects' and 'objects' you must be careful that you do not confuse syntactic roles, the functions word or phrases play in a particular sentence, with semantic roles, the functions words or phrases play with respect to the meanings of verbs.

The core syntactic roles are subject, verb, and object. Every full sentence has a subject and and a verb; there will only be an object if the meaning of the verb and the form of the sentence require it.

A transitive verb like take, for instance, typically involves two semantic roles:

• the Agent, the person who performs the act of taking, and
• the Patient, the entity which the Agent takes

In an active sentence, the Agent is cast in the syntactic role of subject, the verb is cast in an active construction, and the Patient is cast in the syntactic role of object:

_subjectThe kidnappers^AGENT   _activeverbtook   _objectthe little girl^PATIENT

In a passive sentence, however, the Patient becomes the subject and the verb is recast in the passive construction. The Agent may be omitted; if present, it is cast in the form of a preposition phrase headed by by:

_subjectThe little girl^PATIENT   _{passive verb}was taken   _{preposition phrase}by the kidnappers^AGENT

In your sentence

• The passive subject (the 'Patient' who undergoes the action) is she.

• The finite verb is the perfect auxiliary HAVE; it is cast in the present-tense form has and requires its complement to be cast in the past-participle form:

  She has past participle ...

• The next verb is the passive auxiliary BE; it is cast in the past-participle form been as the complement of the perfect auxiliary and requires its complement to be cast in the past-participle form:

  She has been past participle ...

• The final verb is the lexical verb TAKE; it is cast in the past-participle form taken as the complement of the passive auxiliary:

  She has been taken.

The 'Agent' who performs the action is not expressed in your sentence.