For talks about a length of time (an amount of time) 10 minutes, 9 weeks, 25 years etc.
“I have known Dylan for 15 years.”
15 years before ———15 years———– now
“Steven has been trying to catch a taxi for 30 minutes.”
30 minutes before ——-30 minutes——— now
“When I was in University I lived in Toronto for 4 years.”
2003—————4 years————-2007
Since talks about a point of time in the past until now.
“I have known Dylan since 2009.”
2009 ——————–> now
“Steven has been trying to catch a taxi since 6:30pm.”
6:30pm ——————>now
Ago means before now.
“I ordered the pizza 25 minutes ago, it should be here soon.”
= 25 minutes before
A: “How long ago was your last dentist visit?”
B: “It was 7 months ago. I think it’s time for another check-up!”
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