correct the verb tense error.

Below the boughs, the air was full of purple twilight, and far ahead a glimpse of painted sunset sky shines like a great rose window at the end of a cathedral aisle.

nope -- "was" is past tense and "shines" is present tense.

You are correct. The verb tense in the sentence should be consistent. Here's the corrected sentence:

Below the boughs, the air was full of purple twilight, and far ahead a glimpse of painted sunset sky shone like a great rose window at the end of a cathedral aisle.

Below the boughs, the air *is* full of purple twilight, and far ahead *is* a glimpse of painted sunset sky *shining* like a great rose window at the end of a cathedral aisle.

Explanation: In the original sentence, the verb tenses were inconsistent. The first part of the sentence used the past tense ("was full," "shines"), while the second part used the present tense ("a glimpse... shines"). To correct this, we need to ensure that the verb tenses are consistent throughout the sentence. In this case, we changed all the verbs to the present tense to maintain consistency in the sentence.

None. The verb tense used in the sentence is correct.