Do sentences in English always have a subject?

No, sentences in English don't always have a subject. There are two types of sentences where the subject is implied or understood:

1. Imperative Sentences: These are commands or requests. The subject is always "you", but it's usually omitted.

* Example: "Close the door." (Implied subject: "You")

2. Sentences with an Implied Subject: In certain contexts, the subject can be understood from the previous sentence or the overall situation.

* Example: "I'm hungry. Could you please get me something to eat?" (Implied subject of "Could you please get me something to eat?" is "You").

However, most sentences in English do have an explicit subject.

* Example: "The dog barked loudly." (Subject: "The dog")

It's important to note that even though the subject might be implied, it's still grammatically present in the sentence.