Descriptive sentence judgment, please ask real experts to interpret ~~3Q.

I don't know what you mean by descriptive sentences. But these two sentences are inverted sentences, that is, the prepositional phrase indicating the position is placed on the wall and at the gate at the beginning of the sentence, and the sentence is inverted: hang/lay.

Lie-lay-lain intransitive verb

Put down the transitive verb

2. When C only modifies the adverbial at the beginning of the sentence, the subject and predicate of the sentence are reversed.

B is wrong, because can cannot be used with able to, because it is synonymous.

D is wrong because be is a copula in be can to, and the copula cannot be inverted with does, but the specific form of be is advanced to the beginning of the sentence.