noun
BAD : I want to learn English in my own pace.
GOOD : I want to learn English at my own pace.
◆◆◆
You do something at your own pace (NOT in/by etc ): 'With computer assisted language learning, students can work at their own pace.'
noun
BAD : I want to learn English in my own pace.
GOOD : I want to learn English at my own pace.
◆◆◆
You do something at your own pace (NOT in/by etc ): 'With computer assisted language learning, students can work at their own pace.'
Longman Common Errors English vocabulary. Английский словарь распространенных ошибок Longman. 2012