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2 Retagged. Clarified title. Corrected typo.
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({It's been)/ (It's)/ It's} a long time since we last met

Which one is correct?

It's been a long time since we last met.

It's a long time since we last met.

Does the format  (sentence construction) change when a specific time, say 10 years, is given instead of "a long time"?

(It's been)/ (It's) a long time since we last met

Which one is correct?

It's been a long time since we last met.

It's a long time since we last met.

Does the format(sentence construction) change when a specific time, say 10 years, is given instead of "a long time"?

{It's been / It's} a long time since we last met

Which one is correct?

It's been a long time since we last met.

It's a long time since we last met.

Does the format  (sentence construction) change when a specific time, say 10 years, is given instead of "a long time"?

1
source | link

(It's been)/ (It's) a long time since we last met

Which one is correct?

It's been a long time since we last met.

It's a long time since we last met.

Does the format(sentence construction) change when a specific time, say 10 years, is given instead of "a long time"?