The core grammatical component of the phrase is the verb "watch," used in its imperative mood. This initial word establishes the entire phrase as a command or a statement of intent, indicating a desired action. The rest of the phrase serves to modify this action by specifying its object and the conditions under which it should be performed.
A detailed breakdown of the components reveals a clear grammatical structure. "Patriots Day film" is a noun phrase acting as the direct object of the verb; it specifies what is to be watched. Within this noun phrase, "Patriots Day" is a proper noun functioning as an attributive noun (or noun adjunct) that modifies the head noun "film." The terms "free" and "online" are adverbs. "Free" is an adverb of manner, describing how the action of watching should occur (without cost), while "online" is an adverb of place, specifying where the action should take place (on the internet).
In practice, this construction forms a highly efficient search query. The structure of Verb + Direct Object + Adverb(s) directly communicates user intent to a search engine. The user is not forming a question but is stating a desired outcome. This imperative form is typical of action-oriented online searches, where the goal is to access a service or a piece of media under specific parameters, such as cost and location.
