you must wait for the green light .改为否定句
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youmustwaitforthegreenlight.改为否定句youmustwaitforthegreenlight.改为否定句youmustwaitforthegreenlight.改为否定句把
you must wait for the green light .改为否定句
you must wait for the green light .改为否定句
you must wait for the green light .改为否定句
把must 改为needn't
you needn't wait for the green light .