Confusion in Sentence tenses

[deepak1990verma]

Hi ,
I am new to this forum , so may not be using the correct way to access my query sorry for this but curious to know the answer that's why posting it here .

Few Sentences' :

1.It is done
2.It was taught in the class
3.John,Who is believed to have gone
4.It was taken on the rocks

It seems that the above sentences are not correct , in each sentence past participle has been preceded by is/was
example: is done /was taught .Please tell me if the above sentences are correct or not .Reply would be highly appreciated .

thanks,
Deepak

[jlucero]

All four sentences are correct. These are passive constructions that include be + past participle. I'd recommend googling "passive tense" to learn more about it, but all 4 sentences show something happening TO the subject (rather than something being done by the subject).