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Example: Is the formal of にほん に いった こと が ありまづ this : にほん に いきました こと が ありまづ. Or
is the first one used in both cases?
CC BY-SA 3.0
2016-05-28T10:42:43.400
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2016-05-28T12:42:46.843
14267
question
grammar politeness
Usage of ました form and た form with こと
> **V-た form + ことがある** is the formula to say about past experience of doing
> something

In にほん に いった こと が あります  
It's already formal since the ある is written as あります。 **You cannot change the
いった to いきました** when using this pattern。It should only be V-た form. And note
that ある in the end cannot be changed into past form あった since you still have
the experience until now.
CC BY-SA 3.0
2016-05-28T12:29:39.057
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2016-05-28T12:42:46.843
2016-05-28T12:42:46.843
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13611
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answer