Раскройте скобки, чтобы получить present perfect или past simple в отрицательной форме. i … (not/ do) this exercise before. i … (not/ do) this exercise yesterday. we … (not/ go) to school since the first form. we … (not/ go) to school yesterday. you … ( not/ see) a horse last week. you … (never/ see) a horse. he … (not /say) that yet. he … (say) that a minute ago. they … (not/ have) breakfast yet. they …( not/have) breakfast a hour ago.