Question 1

Why is it el lavavajillas if it ends in an -s?

Accepted Answer

Lavavajillas is a compound word made of lava (washes) and vajillas (dishes). In Spanish, compound nouns formed by combining a verb and a plural noun are always masculine, and they use the exact same form for both singular and plural. So, el lavavajillas is "the dishwasher" and los lavavajillas is "the dishwashers".

Question 2

Doesn't fregar mean "to scrub"? Why is it translated as "do the dishes"?

Accepted Answer

While fregar literally means "to scrub" or "to mop", in Spain it is the most common everyday verb used for washing the dishes. You will often hear people say fregar los platos, but in domestic contexts, just saying fregar is perfectly understood to mean doing the dishes or mopping the floor.

Question 3

Why doesn't the sentence explicitly say what we are washing (like fregar los platos)?

Accepted Answer

In Spanish, when the context makes the direct object completely obvious, it is very natural to drop it. Since we are already talking about a lavavajillas (dishwasher), native speakers know exactly what is being washed. Adding los platos at the end is grammatically correct, but leaving it out sounds more natural here.

Question 4

Could we use no debemos instead of no tenemos que in this sentence?

Accepted Answer

Not if you want to keep the same meaning. Tener que expresses a factual need or requirement (we don't need to do it because the machine does the work). Deber is closer to "must" or "should". Saying no debemos fregar would sound like "we must not wash the dishes," as if it were a strict rule or a bad idea, rather than just a lack of obligation.

Con el lavavajillas no tenemos que fregar.

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