Active and Passive Voice

A noun clause never changes its voice. The verb clause (to write with) needs to be changed. 'To be written with' is the correct replacement. Hence, option 3.

The noun clause (my warning) does not change its voice. The verb clause (they take no notice) needs to be changed. Option 3 is the correct usage as we use the third form of the verb along with the verb in the passive voice.

In passive voice, subject (who) becomes the object (by whom). In interrogative sentences, verb precedes the subject. And in continuous tenses, 'being' shows the continuity (in passive voice).

The given sentence is in present simple tense, and none other 'auxiliary' confirms to the same tense, except 'are'. 'Are being' is used in case of present continuous tense. Hence, option 1.

The given sentence is in present simple tense, and none other auxiliary, except 'is', confirms to the same tense. 'Known to' is the correct usage. Hence, option 4.

Whenever the subject is missing in the passive voice, we provide the same while changing into the active voice. Indefinite pronoun 'someone' is the correct subject supplied. Hence, option 4.

Option (1) changes the tense, option (2) does not convert into passive voice and option (3) does not retain the interrogative (used 'a pen is' in place of 'is a pen').

When we propose or affirm something, we use 'it is proposed to do..........'. Hence, option 4.

This is the case of an advise; and to give advise, we use modal 'should'.

This is the case of an advise; and to give advise, we use modal 'should'.

'Please' means that this is the case of a request. This request is made to the second person (you). Hence, option 3.

Milk is contained 'in' a pot.

Verb clause (prosper) becomes (be blessed by prosperity) in the passive voice.

While changing the voice of a sentence from active to passive, we interchange the respective postions of the subject and the object.  Moreover, we use the past participle form of the verb. The object in passive voice is generally preceded by 'by'. Passive of present perfect is present perfect continuous. Considering this, option 3 is the correct answer.

While changing the voice of a sentence from active to passive, we interchange the respective postions of the subject and the object.  Moreover, we use the past participle form of the verb. The object in passive voice is generally preceded by 'by'. This is a case of past indefinite tense. Considering this, option 4 is the correct answer.