Quote:
Originally Posted by yuftos but
-the roads are flooded
when we say;the roads flood;doesn't it sound as if they did it by themselves? |
When a verb can be used both transitively and intransively, normally the subject does not change:
1. Bill ate. (intrans)
2. Bill ate the tomato. (trans)
In both of these examples, Bill is the agent and the subject.
In some verbs¹, however, this is not the case:
3. Bill opened the door. (trans)
4. The door opened. (intrans)
In #3, Bill is the subject and agent; in #4, the door is the subject, and the agent is unspecified.
Cf.
5. The door was opened.
This is the normal passive form: it's very close in meaning to #4. The main difference is one of focus: in #4, we see only the opening door; but in #5, there is also a hint of agency (more imaginative readers may see a shadowy hand on the doorknob).
"Flood" is similar to "open": here,
6. The road flooded.
"flood" is intransitive, and "road" is the subject, but the agent is unspecified.
This on the other hand is similar to #5, if we take it as a passive construction (i.e. the road was flooded by someone):
7. The road
was flooded.
Note however that "flooded" can also be taken as a subject complement, as "flooded" can simply mean "full of water":
8. The road was | flooded.
Does that help at all?
All the best,
MrP
¹ These verbs are often called "ergative". Alternatively, the construction is sometimes called the "middle voice". Similar verbs are "boil", "break", "sink", "shatter", etc. Some grammarians divide them into further sub-categories.