I think it is not always. How long has been ill? How long have you had this car?
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vsureshHow long has he been ill? How long have you had this car?Being ill and having a car are not actions. The OP may be right but it's impossible to say for certain that the continuous tense is alwaysapplicable in such cases even though it probably almost always is. There is usually an exception
Thinking SpainWould you tell me if it's an acceptable definition?I wash my hands of all definitions!