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The phrase "have then changed" is not correct in standard written English.
It may be an attempt to convey a change that occurred after a certain point in time, but the placement of "then" is awkward.
Example: "They have changed their approach since the last meeting."
Alternatives: "have since changed" or "have now changed".
Exact(5)
Things have, then, changed somewhat for the better and this is a story that is rarely reported.
In their frustration, some terrorized countries have then changed tacks, making concessions to political causes supported by terrorists.
What we've seen in the past 15 years is that consumption methods have broadened attitudes, music has changed to reflect that, and attitudes have then changed even further.
Degradation might have then changed both composition and time activity pattern of the Ngumburuni communities.
This original function might have then changed to a primary role in communication, which a wide body of published data is supporting 44, 45.
Similar(55)
If it hasn't, then change it manually.
That system they had then – obviously things have changed.
He has then mapped the change.
Not much, then, had changed in Delhi.
But things have really changed since then.
Have you changed since then?
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com