A Mood is used to identify whether a verb expresses a fact, a command, a question, a condition or a wish. In this case, someone is instructing you to be careful so this is an imperative mood.
the, be, to, of, and, a, in, that, have, I, it, for, not, on, with, he, as, you, do, at, this, but, his, by, from, they, we, say, her, she, or, an, will, my, one, all, would, there, their, what, so, up, out, if, about, who, get, which, go, me