So, we should be patriots. (Imperative)

Patriotism is a noble virtue. (Interrogative) = Is patriotism a noble virtue?/ Isn't patriotism a noble virtue?

It is the greatest of all virtues in a man's life. (Comparative) = It is greater than all other virtues in a man's life.

When transforming an affirmative sentence into a negative one without changing its original meaning, certain structural changes are applied. In this sentence, 'everything just' indicates that all actions performed are just. To make it negative while preserving this meaning, we replace 'everything' with 'nothing but'.

The phrase 'nothing but' effectively conveys the sense of 'only'. Therefore, 'to do everything just' is equivalently expressed as 'to do nothing but just' in a negative structure, meaning the person performs solely just actions. This is a common technique in English grammar transformations for maintaining semantic equivalence while altering sentence polarity.

A simple sentence contains only one independent clause, meaning it has one subject and one finite verb. In the given complex sentence, "so that he can sacrifice his life for the country" is a subordinate clause indicating purpose. To transform a complex sentence with a 'so that' clause into a simple sentence, we can often use an infinitive phrase (to + base form of verb) to express the purpose. Here, "so that he can sacrifice" is effectively replaced by "to sacrifice," making it a simple sentence.

To change an exclamatory sentence into an assertive one, we need to express the strong feeling of the exclamatory sentence as a simple statement. Exclamatory sentences often begin with 'What' or 'How' and end with an exclamation mark (!).

When transforming, the subject and verb are usually brought to the beginning of the sentence. Words like 'very', 'great', 'indeed', or 'really' are often used to convey the intensity that the exclamatory word ('What' or 'How') originally expressed.

In this case, "What an outstanding quality it is!" emphasizes the degree of the quality. The assertive form rearranges the sentence structure to state this fact directly: "It is a very outstanding quality."

A man who has patriotic zeal is called a patriot.

A complex sentence consists of one independent clause and at least one dependent clause. The given simple sentence, "A man having patriotic zeal is called a patriot," contains a participial phrase ("having patriotic zeal") that modifies the noun "man."

To transform it into a complex sentence, we need to convert this participial phrase into a dependent clause. We can do this by using a relative pronoun (e.g., 'who', 'which', 'that') to introduce an adjective clause. In this case, 'who' is appropriate for 'man'.

Thus, "having patriotic zeal" becomes "who has patriotic zeal," forming an adjective clause that describes the man. The main clause remains "A man... is called a patriot," and the entire sentence becomes complex with the addition of the dependent clause.