Подскажите как пожалуйста надо поставить глагол в правильную форму и в правильном времени - Past Simple или Present Perfect

1 Maria got some bad news last week. She has been sad since she got the bad news. 2 I started school when I was five years old. I have been at school since I was five years old . 3 I has changed my job three times this year.  4 I changed my job three times last week.  5 The weather was hot and dry for many weeks.  But two days ago it rained . 6 Tom broke his leg five days ago.  He has been in hospital since he broke his leg