I only know the in forms of them. Maybe again it is that American/British English difference.
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Whl626There are no fixed rules on the use of preposition. It all depends on the context.The Essential English Dictionary has the following example sentence:
eg. He is strong in math.
Marius HancuGoogle:Hi Marius
1 for "competent on grammar"
4 for "competent at grammar"
1,090 for "competent in grammar"
Marius HancuI know (I am not blind/I know how to read).
Think about their meaning. Same prepositi