The word back can be used as an adjective, meaning "towards the rear", as an adverb, meaning "to a previous place", or as a noun, meaning "the rear of a body".
adjective
It can be either. It is an adjective when it precedes a noun (back fence) or when it follows a linking verb (he is back). It is an adverb when it answers the question "where" (reached back, jumped back). It can also be a noun (the back of something or someone).
no, back and front are both transition words.
No. Constrain is a verb. One adjective form is constrained (held in, held back).
No.Went back is a phrasal verb it is the past form of go back.
A predicate adjective is a type of adjective that describes the subject of a linking verb that it follows. It follows the linking verb in the sentence, and then refers back to it.
Very can be an adjective, or an adverb.It is an adverb in "She did it very quickly" It is an adjective in "At the very back of the shop"
Lumbar is the adjective used to describe the lower back. For instance, "The lumbar support in that chair makes it easier to use it for long periods of time."
It depends on how you use it. For example in "I'm going to back the car up" it's a verb. In other uses it can be a noun, adjective or adverb.
Yourself is not an adjective. It's a reflexive pronoun.
In the context of speech, "back" can serve as an adverb, adjective, or noun. As an adverb, it indicates a return to a previous position or state, like "step back." As an adjective, it can describe something that is located at the rear, such as "back row." As a noun, it can refer to the rear part of something, like "the back of the room."
Yes, back-to-school is hyphenated when used as an adjective phrase before a noun, such as "back-to-school shopping."