Explanation

Active Voice: They say

Passive Voice: It is said

Present Indefinite Tense

Active Voice: Subject + Verb + Object

Passive Voice: Object + is/am/are+ third form of a verb + by + subject.

Explanation

For is a preposition here.

For is used to refer a reason.

For actions means اعمال کےلئے

Explanation

Cattle means مویشی

Swarm means مچھر یا تڈی دل وغیرہ کا بہت بڑا اڑتا ہوا گروپ

Troop means فوجی دستہ

Herd means ریوڑ

Explanation

The definite article is used before singular and plural nouns when the noun is specific or particular.

Explanation

The word 'Milk' is an uncountable noun. 

We generally use 'some' with uncountable nouns. 

There is some milk in this Jug means اس جگ میں کچھ دودھ ہے

Explanation

We generally use on after enlarge.

On is a preposition here.

Enlarge on کسی چیز کے بارے میں بہت باتیں کرنا

Explanation

Dispense with means dispose of.

Dispense with means چھٹکارہ پانا

You can't dispense with the use of fan in summer. 

Explanation

Active Voice: Who

Passive Voice: By whom

This is a sentence of Past Indefinite Tense.

Was and Were are the helping verbs of Past Indefinite Tense.

Active: Who solved that problem?

Passive: By whom was that problem solved?

Explanation

In both form of sentence meaning is same only structures of words are changed. In active sentence subject is ‘’Grapes’’ object is ‘’thistles’’ and verb is ‘’gather’’. When we change into passive voice object ‘’thistles’’ will become subject and subject ‘’grapes’’ will become object. In passive form after ‘’cannot’’ ‘’be’’ will be used and verb will be written in past participle.

Explanation

Industrious   محنتی