Yes, it is a fragment.
fragment sentence
Choose the term that best fits this group of words. just when we were least expecting it
This is not a question. It needs a noun to know what "it" is.
A sentence fragment is a part of a sentence, such as just the subject noun, or just a verb.
The phrase "just when you were least expecting it" is an introductory dependent clause. It sets the stage for an event or situation that occurs unexpectedly, creating anticipation or surprise. This clause cannot stand alone as a complete sentence, as it lacks an independent clause to provide a complete thought.
The term that best fits the sentence "just when we were least expecting it" is "serendipity." This word captures the essence of an unexpected event or discovery that occurs at an unforeseen moment, often leading to positive outcomes. It emphasizes the surprise element of the occurrence and the fortuitous nature of the timing.
when you're least expecting it
A sentence fragment is an incomplete sentence. A complete sentence requires at least a subject and verb. A sentence fragment is missing one of these.
It is just a fragment, not a sentence. It has no verb or object.The man quickly drank the tea because he had to catch the bus.
sentence is a complete thought with a noun and verb. Fragment is just part of a sentence and does not make a complete thought.
Fragment.
It is a fragment that shouldn't be capitalized or punctuated.