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Questões por página:
The verb phrase in “has been hindered” (4th paragraph) is in the 
Analise a sentença ativa a seguir:
"The sudden spike in inflation has severely undermined the purchasing power of the middle class."
Assinale a alternativa que apresenta a transposição correta e equivalente para a voz passiva: 
Consider the sentences from the text:

"The mysteries shrouding Peru's Nazca Lines have intrigued scientists for decades."
"They were created during the Nazca culture."
"A research team led by Masato Sakai [...] has discovered [...] over 350 new etchings since 2004."

The verb forms used in the sentences are correctly explained in:
Read the excerpt below.

"He is believed to have shown up quietly as the show started [...]"

The structure "is believed to have shown up" indicates that 
In the passive voice, the focus shifts from who performs the action to what receives it. To transform an active sentence into a passive one, the object of the active sentence becomes the subject; the verb is formed with the appropriate tense of the verb "to be" + the past participle of the main verb; and the original subject (the agent) may be introduced by "by," when relevant. The verb tense of the active sentence must be preserved in the passive construction.

Consider the following sentence in the active voice:

"The manager approved the new project last week."

Mark the alternative that correctly transforms the sentence above into the passive voice.