By then, I had been living here for several years...
By then, I had been living in Canada for fifteen years...
By then, I had been living in America for eight years...
I am originally from Germany, but by now I have been living in the UK for more than 25 years.
By now, I have been living another life for twenty years in the northern Virginia suburbs.
By now, I have been living for 17 years on the island.
By now, I have been living in Washington for more than two months.
1. I've been living here for 4 years
2. I've lived here for 4 years
I love Northbridge right now. I've been living here for the past 2 years
I'm in Karachi right now. I've been living here for several years.
By now I've been living here for a year
"What DID happen?"
Actually, this is used for emphatic expression (surprise, shock, disbelief).
So if that didn't happen, then what DID happen?
What did just happen?
– is not a correct neutral way of forming this question. ‘What’ here is not the object of ‘happen’, but the subject: It happened => What happened? ‘Happen’ is an intransitive verb and cannot take an object (“†It happened an earthquake” is grammatically incorrect).
You can, however, say “What did just happen?” as an emphatic question:
— Woah, what just happened?
— Yeah, what did just happen?
This is a different use of ‘do’, of course, where the main verb is emphasized. It differs from the purely automatic ‘do’ that appears in subject-auxiliary inversion. Similarly, you could also say, “Who did do that?” as an emphatic variant of “Who did that?”.
Declarative sentences with negative elements (i.e. never or not) are formed. See also Negative inversion.
Example #1: Never again shall I watch that opera!
Example #2: Not since childhood did she eat cotton candy.
Declarative sentences with restrictive elements (i.e. only or so) are formed.
Example #1: Only on Fridays does he go to the bar.
Example #2: So hard did she work that she overslept the next day.
Example #3: So did I.
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