"Have a look" is an imperative sentence.
Yeah! No problem
Lexi was being kind of snobbish to me.
What kind of sentence? The kind of sentence in which the word kind is being used. Oh, thank you. That was very kind.
Your sentence is a question and the content is nonsense!
What kind of sentence? A long sentence.
Other words could provide clues/hints on what the word is, especially before or after the word; look at similar words or phrases in the sentence to extract it from the sentence.
Example sentence - It is more important to be kind than right.
That is a simple, declarative sentence.
a sentence that tells a fact is a declarative sentence
This kind of sentence is called a declarative sentence.
That is a kind of sentence called a question. This is a kind of sentence called a statement: Some people ask silly questions.
It is an imperative sentence.