What is the difference between an implied subject and a dangling modifier error?

Question

''After farming the whole day, the rains disappointed her. ''

Answer 1

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The only form that has an implied subject is the imperative:  Turn left at the corner.  Shut

 up!  Please sit.  These are all addressed to the listener, an implied “you.”  “You” is the implied subject.

The subject of the sentence above is “the rains.” The rains performed the action; they disappointed her.  Because “the rains” are the subject, the modifier describes them.  But rains cannot farm all day.

The error can be fixed by changing the second part, the actual sentence, to the passive voice:  After farming all day, she was disappointed by the rain.

Answer 2

They are two different things. You get an implied subject in a command: Do not deface this notice with the pencil provided. No subject is given, and the sense is clear.  A dangling modifier omits the subject eg :  Looking through the window, the room seemed very large. As you can see the subject is missing and it is the sense that goes out the window. To fix your sentence: After farming the whole day, she was disappointed by the rains. This provides the correct subject and the modification works.