Give me a good example of a topic sentence

fortune hunters encounter many difficulties when exploring a shipreck.

The topic is "exploring a shipwreck" and the controlling idea is "many difficulties."

Explanation:

Essentially, it conveys the main idea of a paragraph. When used throughout an essay, topic sentences make up its backbone, giving your arguments a clear support system. They help guide you as the writer, keeping your arguments on point, and they also help guide the reader.

the sentence does not violate the phrase structure second rule (introduced by noam chomsky) because noun phrases consist of a determiner such as a, the or every, and a noun. in the sentence, the noun phrase the cake includes a determiner (the) and a noun (cake).

on the other hand, the first rule indicates that a sentence encloses a noun phrase, followed by a verb phrase. the example sentence can be analysed as follows:

john (n) + ate (v) + the (det) + cake (n).