I have been studying law since 1992. Since that journey, I never sailed again.
Since that journey, I have never sailed again. When you talk about an action or situation which began in the past and continues into the present, use a present perfect tense: ‘I’ve been waiting here since 9 o’clock.’ In informal American English, the past tense is also used for this purpose. See also FOR 4 2
I have been living in London since four weeks now.
I have been living in London for four weeks now. I’ve been working in a bank since two years ago.
I’ve been working in a bank for (the last) two years. since + beginning of period: ‘since 3 p.m.’ for + length of period: ‘for two and a half hours’ Compare: ‘I have been living in London for almost two years, since October 1994.’ 3
Since the last few year s, unemployment has been increasing.
Over/during the last few years, unemployment has been increasing. since + beginning of period: ‘I’ve been living in Paris since July.’ over/during + the period of time within which something happens or develops: ‘Over the last eighteen months there have been three tax increases.’ 4
I stayed at your hotel for three nights, since 23rd November to 26th November.
I stayed at your hotel for three nights, from 23rd November to 26th November. from ... to ... : ‘from Monday to Wednesday’, ‘from 7 a.m. to 3 p.m.’, ‘from 1947 to 1966’ 5
Bring Eva with you. It’s ages since I haven’t seen her.
Bring Eva with you. It’s ages since I (last) saw her. It’s a long time since I haven’t seen you last.
It’s a long time since I saw you last.
