Mr. McGregor was quite sure that Peter was somewhere in the tool-shed, perhaps hidden underneath a flower-pot.
He began to turn them over carefully, looking under each.
文字解析：
1、turn sth over：把…逐件翻查，翻阅，反复考虑
Presently Peter sneezed—'Kertyschoo!' Mr. McGregor was after him in no time.
And tried to put his foot upon Peter, who jumped out of a window, upsetting three plants.
The window was too small for Mr. McGregor, and he was tired of running after Peter. He went back to his work.
文字解析：
1、presently：不久，马上
2、kertyschoo：阿……嚏!
3、in no time：立刻，马上，很快
