Change the sentences according to directions.

A simple sentence contains only one subject and one finite verb, expressing a single complete thought. The original sentence, "The people who are poor cannot afford to take a balanced diet," is a complex sentence because it has a main clause ("The people cannot afford to take a balanced diet") and a subordinate adjective clause ("who are poor") modifying "the people."

To convert this into a simple sentence, the subordinate clause needs to be condensed into a word or a phrase. The adjective clause "who are poor" can be replaced by the noun phrase "the poor," which collectively refers to poor people and acts as the subject of the simple sentence. This transformation reduces the sentence to a single independent clause with one finite verb ("cannot afford").

An exclamatory sentence expresses strong emotion or surprise. To change an assertive sentence containing 'very' or 'great' into an exclamatory one, we often start with 'How' or 'What'. If the assertive sentence has 'very' followed by an adjective, we typically use 'How' before the adjective. The structure becomes 'How + adjective/adverb + subject + verb!' In this case, 'very concerned' becomes 'How concerned', followed by the subject 'they' and verb 'are'.

It should be known by everybody that malnutrition causes weakness.

Passive voice is a grammatical construction where the subject of the sentence receives the action of the verb. In the original sentence, 'Everybody' is the active subject performing the action of 'knowing'. To transform it into passive voice, the object 'it' becomes the new subject.

The structure for converting a sentence with a modal verb (like 'should') into passive voice is modal + be + past participle of the main verb. Thus, 'should know' becomes 'should be known'. The original subject 'everybody' is then introduced as the agent using 'by everybody', although it can often be omitted when the agent is general.

The clause "that malnutrition causes weakness" functions as a noun clause, providing further information about 'it'. This type of subordinate clause typically remains unchanged when the main clause containing it is converted to passive voice.