Learn German: Sind die Tomaten teuer? Nein, sie sind nicht teuer. - Are the tomatoes expensive? No, they are not expensive.

When negating an adjective like teuer (expensive), the word nicht goes directly in front of it. This works exactly like saying not expensive in English.

Does sie mean she or they in this sentence?

Here, sie means they. It refers back to the plural noun die Tomaten (the tomatoes). You can tell it means they because it is paired with the plural verb sind (are). If it meant she, the verb would be ist.

Why does the first sentence start with the verb Sind?

To ask a yes or no question in German, you move the verb to the very beginning of the sentence. The statement Die Tomaten sind teuer becomes the question Sind die Tomaten teuer?

How can I tell that Tomaten is plural here?

The singular word for tomato is die Tomate. To make it plural, German adds an -n to the end, giving us die Tomaten. The plural verb sind (are) also confirms we are talking about more than one tomato.