Which choice shows the proper way to use a colon?
-warning: if taken internally, consult a physician immediately.
-warnings are written: on the following labels medicines, cleaning products, and some foods.
-there is: one thing you should always read a warning label.
my doctor said, “read the label.”

-Warning: If taken internally, consult a physician immediately.

Explanation:

A colon is a grammatical punctuation mark used in sentences for the separation between an independent clause and the dependent clause. But more importantly, they are used to separate such clauses when the second clause is used to explain the first clause.

Among the given examples, the correct usage of the colon is in the first sentence.

Warning: If taken internally, consult a physician immediately.

While the other sentences are normal, regular sentences The use of this mark in the other two sentences, especially the placing of it in a free flowing sentence is wrong. As for the first option, the colon just after "warning" emphasizes the importance of the given information. Also, the next sentence after the colon mark gives an explanation of why the first part of the sentence is used.

“thy baited hooks shall tangle me no more.”

“hath taught me to set in trifles no store,”

“me lusteth no longer rotten boughs to climb.”

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).