Look at the exemples and complete the explanations 1) 1665,isaak newton made an in important discovery we use the past for comleted actions in the past 2)he was studying at cambtige university we use the past to describe the situation at a particular time in the past 3)he was sittinv under a trer when an apple fell on his head we use the and together when one action was in progress action interrupted it. двадцать