Вставьте нужный вспомогательный глагол,соответствующий времени (Present Simple, Present Continuous, Present Perfect,

 1) Olga is swimming now. 2) The weather was hot last summer. 3) He was a teacher two years ago. 4) Where are your sisters at the moment? 5) Have you seen this cartoon? 6) They have cleaned the house. 7) I am looking after my little brother now. 8) She was cooking, when I went in the park. 9) Bob and Alice are watching the new opera now. 10) He was at his granny last summer.