The purpose of this paper is to describe the meanings of some adverbs based on the event-structural semantics. The subclass of the adverb depends on the syntactic and semantic view of points. Traditionally the adverbs in syntax can be analyzed into a two major categories such as the sentential adverbs and the predicate adverb. On the other hand, the subclass of adverb in semantics is classified with the argument of modified constituent. However, the adverbs can be treated as a predicate of the event or individual as their arguments. It means that the adverbs take the sub-event which verbs represent, when decomposing the meaning of the verb. For instance, some adverb takes the ``x CAUSE y`` and ``x BECOME y`` as the arguments. We argue that it is necessary to introduce the some operators such as <, ∋, CR, UNDER. < represents the order of the event occurrence and ∋ represents the relation between two events, and one event is of a member of the other event. The CR is the contextual restriction, that is, the event can be interpreted in given domain. And the operator UNDER is a function from the event to the event. We try to describe the four different kinds of adverbs as the representative adverb having event structural meaning. That is the domain adverb, restitutive adverb, manner adverb, and measure adverb.