HOW WELL CAN YOU SAY THESE?
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Numbers, percentages, describing pie-charts, figures, saying dates and phone numbers easily, or spelling a file reference over the phone, like a native speaker.
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Or speaking properly about what surrounds us, locations, the time of day, appointments, small talk etc.
Also learning how to use idioms in a corporate environment (for example, while negotiating):
These are like the icing on the cake and will make you sound really fluent and PRO
And you’ll understand your counterparts better