5.4.1 Adverbs
In (173a), given that there is no light verb with an unaccusative verb, the adverb must be adjoined to the VP. In (173b) the adverb is adjoined to a vP headed by an agentive light verb and in (173c) and (d) it is adjoined to a vP headed by aspectual morphemes. Thus there seems to be no limit in principle on what the adverb can adjoin to. In each of these cases however, the adverb is adjoined to a higher position than the verb moves to. When there is no light verb, as in (173a), the verb is not forced to move out of the VP and in this case the adverb can adjoin to the VP. If the verb moves out of the VP, however, the adverb cannot adjoin to it. Indeed, anything that the verb moves out of is out of bounds for an adjunction site for the adverb. This suggests that the adverb interacts with the movement of the verb and it is this interaction that determines the possible adjunction sites for the adverb. Specifically, it seems that the verb never moves over the top of the adverb. Hence, we may assume that in principle an adverb can adjoin to any part of the extended VP, including any light verb projection, as long as the verb remains lower than it at S-structure and does not move over its adjunction position. There are a number of ways in which we might attempt to account for this fact, but at present we will be satisfied at leaving it as a descriptive generalisation.