Learn Dutch: We gebruiken regelmatig een liter olijfolie per maand. - We regularly use one liter of olive oil per month.

In Dutch, when you express a quantity using a unit of measurement (like een liter) followed by the substance being measured (like olijfolie), you place the nouns directly next to each other. You do not use a preposition like van (of), unlike in English.

Why does the adverb regelmatig come before the direct object?

Adverbs of time and frequency like regelmatig (regularly) generally appear early in the sentence's middle section, right after the conjugated verb and subject. Because the direct object een liter olijfolie is indefinite (it introduces new, non-specific information using een), the adverb naturally precedes it.

Could I use in de maand instead of per maand here?

Yes, in de maand and per maand are both perfectly natural and mean the exact same thing in this context. You might also encounter een liter olijfolie de maand, dropping the preposition entirely when expressing a recurring rate over time, though per maand is the most standard.

Why is olijfolie written as one solid word?