改错one day I noticed a little boy to come into the garden and put a letter into the mail-box .

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改错one day I noticed a little boy to come into the garden and put a letter into the mail-box .
改错one day I noticed a little boy to come into the garden and put a letter into the mail-box .

改错one day I noticed a little boy to come into the garden and put a letter into the mail-box .
去掉t o
one day I noticed a little boy come into the garden and put a letter into the mail-box .notice somebody do sth