Chapter 12, Drill c: Practice using "existential est" (est without complement).

Each Latin sentence has some form of the verb sum. In some sentences it has a complement; in others it does not and means "there is" or "there are". For each, tell whether the verb means "is" or "are", or "there is" or "there are". Note: it's possible that a sentence like est puella tristis might also mean "she is a/the sad girl", but given your two choices, it would mean "there is a sad girl".

Example:
sunt coloni in agro. Answer: there are: the fact that the sentence begins with sunt is a clue.