In the question asked,
since the underlined word is undetermined. If the underline word is “were staying”
only this would probably mean only a simple predicate. Notice that the phrase
structure is only composed of a linking verb and the word verb or rather gerund
“staying”. Contrarily, if the underlined word is “were staying at a cozy
little cabin in the mountains”, this would indicate a complete predicate.
Which entails the linking verb the verb and the situation which describes the
sentence.
