It seems you're engaging with different statements regarding sentence structure.
-
"A phrase... is lacking a subject, a verb, or both." - This statement suggests that a phrase alone may not have the necessary components of a complete sentence.
-
"always contains a verb." - This is generally not true for phrases, as phrases can exist without verbs, such as noun phrases.
-
"always contains a subject." - Similar to the verb statement, this is not universally applicable to all phrases, as many phrases do not explicitly contain a subject.
-
"contains a subject and a verb." - This would be true for a complete sentence, but not necessarily for a phrase.
In summary, a phrase does not require a subject or verb to exist, but a complete sentence does require both a subject and a verb. If you need clarification on any specific point or concept, feel free to ask!