Learn Hardcore Italian: Il vento soffia contro la finestra.

Il means "the" (masculine singular); vento means "wind"; soffia is the third person singular present tense of the verb soffiare, meaning "blows"; contro translates as "against"; and la finestra means "the window" (with la being the feminine singular article).

Why are the articles il and la used in this sentence?

In Italian, nouns have gender. Vento is a masculine noun, so it takes the masculine singular article il, while finestra is a feminine noun that takes the feminine singular article la.

How is the verb soffia conjugated, and why is this form used?

Soffia is the third person singular form of soffiare in the present tense. This form is used because the subject, il vento (the wind), is singular, and the verb must agree with its subject in both number and person.

Why is the preposition contro used here instead of verso or another alternative?

Contro is chosen to convey a sense of opposition or impact—the wind is blowing forcefully against the window. In contrast, verso typically indicates direction toward something without the implication of resistance or impact; hence, contro is the more appropriate preposition in this context.