What the element ‘-es’ indicates is third person singular, present tense, the element ‘-ed’ past tense, and ‘-ing’ progressive aspect. Since they are the smallest unit of language and meaningful, they are also（）.

Describe the process of language perception，comprehension and production.

The sentence structure is （）.

What essentially distinguishes semantics and pragmatics is whether in the study of meaning （）is considered.

The relationship between the embedded clause and its matrix clause is one of a part to the whole.