tenses - Aspect (simple, perfect and progressive): What are the differences?


Could you please explain to me the differences between the simple, progressive and perfect aspects.


"Simple aspect" means completed action (action starts and finishes) but I don't really understand the fine details.


For example, with these sentences:



It usually rains in the fall.
He smokes 15 cigarettes a day.
I slept for a long time yesterday.



Here's what I understand: if I didn't complete sleeping I should use "I was sleeping". If it doesn't stop raining we can't say "it is finished". Is that correct?


For continuous aspect, duration is an important factor – but how?


For example:



She is wearing a jacket.



Normally "to wear" action is completed but we can use here present continuous aspect.


Another example:



She has been wearing the same jacket for 3 days.



and why can't I use continuous aspect here?



I have cleaned my room.



It means that my room is clean now. Action is finished but why can't I say "I have been cleaning room" like "They have been playing in the mud"? Action is completed but we don't care here about completed, we are caring about duration, why?




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