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Las ventas han mejorado mucho este mes.

Las ventas han mejorado mucho este mes.
Sales have improved a lot this month.
From Lesson 150:Present perfect versus preterite·Spanish (Spain)

Questions & Answers about Las ventas han mejorado mucho este mes.

Why is the Pretérito Perfecto (han mejorado) used here instead of the simple past?
Because of the time marker este mes (this month). In Spain, when an action happens in a timeframe that is not over yet, like hoy, esta semana, or este mes, you use the Pretérito Perfecto instead of the Pretérito Indefinido (the simple past, like mejoraron).
Why is it han mejorado and not ha mejorado?
The verb needs to match the subject, which is las ventas (the sales). Since the subject is plural, we use the plural form of the helper verb haber, which is han.
Since ventas is feminine plural, shouldn't mucho change to muchas to match it?
It would change if it meant many sales (muchas ventas). But in this sentence, mucho means a lot and describes the verb, telling us how much the sales have improved. When it modifies a verb, it acts as an adverb and its ending never changes.
Is the verb mejorar related to the word mejor (better)?
Yes! Mejor means better, and the verb mejorar means to get better or to improve. To form the past participle used in this sentence, you just drop the -ar and add -ado, giving you mejorado (improved).

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