Learn Dutch: De ober pakt twee kopjes thee. - The waiter takes two cups of tea.

In Dutch, when you express a quantity of a substance, you usually put the two nouns right next to each other. You don't need a connecting word like "of". So, "two cups of tea" is simply translated as twee kopjes thee.

How does the diminutive work in the word kopjes?

The standard word for "cup" is kop. To make it a diminutive (a small cup), you add -je to get kopje. Because the waiter takes twee (two) of them, it needs to be plural. To make a diminutive plural in Dutch, you just add an -s at the end, giving you kopjes.

If I wanted to say "the little cup", would it be de kopje or het kopje?

It would be het kopje. A very handy rule in Dutch is that all diminutive words (words ending in -je) automatically take het, even if the original base word was a de word (like de kop).

Could I use the verb neemt instead of pakt for "takes"?

Yes, you could say De ober neemt..., but pakt (from the verb pakken) is very natural here. While both mean "to take", pakken emphasizes the physical action of grabbing, fetching, or picking something up with your hands.