Trasformazione da forma passiva a forma attiva

Le frasi alla forma attiva sono più semplici da comprendere delle frasi formulate alla forma passiva. Trasformare una forma passiva in una forma attiva è semplice, ma richiede un po' di pratica. Nella tabella di equivalenza riportata qui di seguito si nota che il tempo dell'ausiliare to be nella forma passiva è sempre uguale al tempo del verbo principale della forma attiva. Per trasformare la frase in attiva, il soggetto della frase deve diventare esplicito

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Forme attiva e passiva di 'to keep'

Forma	Attiva	Passiva	Frase attiva	Frase passiva
Simple present	keep	is kept	I keep the butter in the fridge.	The butter is kept in the fridge.
Present continuous	is keeping	is being kept	John is keeping my house tidy.	My house is being kept tidy.
Simple past	kept	was kept	Mary kept her schedule meticulously.	Mary's schedule was kept meticulously.
Past continuous	was keeping	was being kept	The theater was keeping a seat for you.	A seat was being kept for you.
Present perfect	have kept	have been kept	I have kept all your old letters.	All your old letters have been kept.
Past perfect	had kept	had been kept	He had kept up his training regimen for a month.	His training regimen had been kept up for a month.
Simple future	will keep	will be kept	Mark will keep the ficus.	The ficus will be kept.
Condizionale presente	would keep	would be kept	If you told me, I would keep your secret.	If you told me, your secret would be kept.
Condizionale passato	would have kept	would have been kept	I would have kept your bicycle here if you had left it with me.	Your bicycle would have been kept here if you had left it with me.
Infinito presente	to keep	to be kept	She wants to keep the book.	The book wants to be kept.
Infinito passato	to have kept	to have been kept	Judy was happy to have kept the puppy.	The puppy was happy to have been kept.
Participio presente e gerundio	keeping	being kept	I have a feeling that you may be keeping a secret.	I have a feeling that a secret may be being kept.
Gerundio passato	having kept	having been kept	Having kept the bird in a cage for so long, Jade wasn't sure it could survive in the wild.	The bird, having been kept in a cage for so long, might not survive in the wild.

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