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[MAZEN gamal]

هناك جملة اخرى وقفت عندها فى unit 4
If only one bird pulled a string;the box didn't move
why he didn't say (wouldn't move
why he used past simple in both sentences
and the sentence which followed is the same
If the two birds pulled a string it moved
I think there is also a mistake as I think he should say the string instead of a string
as it was mentioned before when he said (they had to pull a piece of string) ?????????????????