“The student” in the sentence “The student liked the linguistic lecture”, and “The linguistic lecture” in the sentence “The linguistic lecture liked the student.” belong to the same syntactic category.

In English, “pill” and “bill” are （）.

The fact that different languages have different words for the same object is good proof that human language is （）.

“John killed Bill but Bill didn’t die” is a (n) （）.

The sentence structure is （）.