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was looking through； found am looking through； find looked through； had found had looked through； finding
he found a letter in the letter-box a letter was found in the letter-box a letter was in the letter-box the letter-box had a letter in it
John found a letter in the mailbox a letter was found in the mailbox. a letter was in the mailbox the mailbox had a letter in it
John found a letter in the mailbox a letter was found in the mailbox a letter was in the mailbox the mailbox had a letter in it
was looking through； found am looking through； find looked through； had found had looked through； finding
was looking through； found am looking through； find looked through； had found had looked through； finding
did he find until he found that he found had he found
was looking through; found am looking through; find looked through; had found had looked through; finding
be found a letter in the letter-box a letter was found in the letter-box a letter was in the letter-box the letter-box had a letter in it
letter of congratulations letter of thanks letter of criticism commendatory letter
seated wrote sitting, written seating writing seated writing
did he find until he found that he found had he found
was looking through； found am looking through； find
looked through； had found had looked through； finding
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