Odpowiedź:
1.I live in Beykent since 1996. I live in Beykent for 25 years.
2.I'm at school since October. I'm at school for 5 months.
3.She likes him since 1991. She likes him for 30 years.
4.I need a new apartment since December. I need a new apartment for 3 months.
5.My grandpa is sick since last year. My grandpa is sick for a year.
6.I know him since 1990. I know him for 31 years.
7.He is wearing jeans since Tuesday. He is wearing jeans for 5 days.