Components of a Sentence

A gentleman is waiting for you.

4. The use of 'there is', 'there are'. There is a cat in the room.

5. The use of special devices, like 'as for', 'but for', etc.: As for him, I don't know.

6. Inverted word order: Here comes the sun.

7. The use of emphatic constructions: It was the cat that ate the rat.

However, sometimes the most important information is not expressed formally: The cat ate the rat after all. The rheme here is 'the rat'. At the same time there is very important information which is hidden or implicit: the cat was not supposed to do it, or - it was hard for the cat to catch the rat, or - the cat is a vegetarian (this hidden information will depend on the context or situation). In other words, we may say that this sentence contains two informative centres, or two rhemes - explicit and implicit.