How to contract "It's very quiet outside the window this time of year

The abbreviated sentence for It's quiet outside the window at this time of day is: It's quiet outside the window.

There are five ways to reduce a sentence:

I. Delete the modifier before "the".

For example, "The beautiful butterfly flew away." In the sentence, the word "beautiful" is used to modify the word "butterfly", so it should be deleted.

Second, delete the modifying and limiting components before "ground".

For example, "People cried out in surprise." In the sentence, "were surprised" is used to modify "shouted up", to be deleted.

Third, delete the "got" after the additional description of the component.

For example, "He jumped for joy." In the sentence, "jumped up" is an additional description of the degree of "happy", to be deleted.

Four, delete the quantitative phrases.

For example, "Rodin made a statue of a woman." In the sentence, the quantitative phrase "a" can be deleted.

Fifth, seize the main body to abbreviate.

As long as you grasp the main stem of the sentence "who does what" or "what how" (which is every complete sentence has), you can quickly shrink the sentence. For example, "The iron balls fell from the heights at the same time." This sentence: says "What?" -- "The iron balls," "How?" --"Fell." Therefore, the sentence can be reduced to, "The iron ball fell."

Reducing sentences sometimes requires a combination of methods. For example, "Several small birds flew freely in the air." This sentence could be reduced to: the little birds flew.

Since the reduction is to help understand the sentence, it doesn't have to be the simplest. As long as the sentence is understood, that's all that matters. It's fine to keep the complements, and it's fine to delete them, but it depends on the context. "着、了、过" is a tense auxiliary, and auxiliaries have little independence in a sentence, so they can't be deleted.