ling-fly

lesson 14
jack like study history very much,  one sunday morning he was planning to  visit  a museum he hurried to the station to catch the 7;30 train, as soon as he got there he tried to buy a ticket for that train  , the ticket  clerk said :" the 7;30 train has just left ,the next train will leave in 30 minutes" "has the 7;30 train gone already? ,it 's  7;27 by my watch "said jack, the clerk said with a smile" look at that clock on the wall , it's already pass 7;30 ,your watch is 3 minutes slow"