Давайте разберём ваши предложения и откроем скобки, используя правильные времена: Present Perfect и Past Simple.
a) When you started your work? - I started it 3 days ago. I have not seen her since 2010.
b) The wind is blowing but it has stopped raining.
c) They were in Paris last week but now they have returned to Moscow.
d) Look at the car. I bought it last week.
e) She has not rung her mother this week.
Если у вас есть ещё вопросы или нужно объяснить использование этих времён, не стесняйтесь спрашивать!