Learn Spanish (Spain): Las actrices dieron un buen espectáculo.

Dieron is the "they" form of the verb dar (to give) in the simple past tense. Even though dar is an -ar verb, it is irregular in the past tense and borrows the endings of regular -er and -ir verbs. Since las actrices is a plural group ("they"), we use dieron.

Why does the word "actrices" end in "-ces"?

The singular word for "actress" is actriz. In Spanish, whenever a noun ends in -z, you must change the -z to a -c before adding the plural ending -es. Therefore, actriz becomes actrices.

Why is it "un buen espectáculo" instead of "un bueno espectáculo"?

The adjective bueno (good) drops its final -o and becomes buen whenever it is placed directly in front of a masculine singular noun. Because espectáculo is a masculine singular noun, we must use buen.

Does "espectáculo" mean the same thing as the English word "spectacle"?

It looks similar, but in everyday Spanish, espectáculo is simply the standard word for a "show" or "performance" (like a theater play or a concert). It is much more common than the English word "spectacle" and doesn't usually carry a negative meaning.