Some subjectless sentences introduced by a bare verb caught my attention. English language has low tolerance for pro-drop phenomenon. Hence, I assume these subjectless sentences are not declarative clauses. The paper analyzes this linguistic phenomenon from the perspective of Governing and Binding Theory and borrows some concepts from Functional Grammar. The conclusion is:(1) they can be regarded as let’selided imperatives with advising function;(2) the introductive verbs show features of conjunction and preposition, which implies infl ectionless word-class conversion may occur. Some subjectless sentences introduced by a bare verb caught my attention. Therefore, I assume these subjectless sentences are not declarative clauses. The paper analyzes this linguistic phenomenon from the perspective of Governing and Binding Theory and borrows some concepts from Functional Grammar. The conclusion is: (1) they can be regarded as let’selided imperatives with advising function; (2) the introductive verbs show features of conjunction and preposition, which implies infl ectionless word-class conversion may occur .