-they would chat
The word charlarían is the conditional form of charlar in the third person plural.
See the full charlar conjugation


Las noches siguientes, Nathan y Vadim charlarían juntos muy a menudo. Deborah iba de vez en cuando y se sentaba con ellos a escucharles.
During the course of the next few evenings, Nathan and Vadim were often together for long periods of time, talking.
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