Learn English – “I have been saying it” vs “I have been said it”

It's been a long time since I went to Canada.

To me, the above sentence is ideal only in cases where there is only one visit to Canada. In that sense, it would be both a first and the last (most recent) visit. That said, it's a valid construction in a situation where multiple visits had occurred, but in these cases I’d argue for:

It's been a long time since I have been to Canada.

The way I figure it, the statement above has two main pieces of information:

1. I have been to Canada (at least once; possibly multiple times)

2. It has been a long time since then (since my last visit)

Broken down the same way, the first sentence has these two main pieces of information:

1. I went to Canada (most likely just once)
2. It's been a long time since then (since my one and only visit)

So it comes down to what you want to say. This might be the situation:

1. I went to Canada throughout my teens
2. It's been a long time since then

You could make an argument for either option in this case, but I maintain that the second sentence would more clearly indicate multiple visits.

Neither sentence is grammatical English or something that a native would typically say, so it is pointless to argue over what they might mean. I don't see a reason to correct them differently.

“*This would not have been happened” is a passive construction. But happen is not a transitive verb, so it cannot be used in the passive voice. It is likely that the author of this sentence intended to write “This would not have happened”, i.e. the event mentioned previously would not have taken place.

In addition to the previous defect, “*this would have not been happened” is incorrect because the negation cannot be placed where it is. The negation word not is normally placed after the first auxiliary: “this would not have …”.

Furthermore, the second part of the sentence is in the wrong tense. “This would have happened” is a past conditional. The part of the sentence introduced by if is a past hypothetical. It needs to be in the past tense because the time of the action is in the past; in addition, the hypothetical aspect is expressed by a past tense, which means the verb needs to be in the pluperfect tense: “if you had not been there at that time”.

A correct sentence resembling these two incorrect sentences is

This would not have happened if you had not been there at that time.

I can't think of a correct sentence with a different meaning that could be what the author was trying to express.