Possible Clues:

• At work, log on, accessing word for translation, knowing only English?
• Speaking only one language
• Using only one language
• Meeting about long novel using one language
• Bring up for discussion around long adaptation the only way one knows, in a manner of speaking
• Cat's fate, to keep working with single tongue
• Speaking in one language, it's open to discussion to admit long adaptation
• Without a second language
• Speaking or writing only one language
• Welshman perhaps who can't cope with the English?