This is a casual form that is acceptable in conversation and in chatty written English. It is not suitable for formal writing. ".
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Mr. TomIs "costly" formal and "expensive" informal?To me, no. I would happily use both words at all levels of English -- conversational or formal -- though "expensive" comes to me slightly more readily and I'd guess it's a more common word.
Mr WordyTest. Please ignore.
Mr. TomI didn't understand this, Mr. Wordy? What should I ignore?The message that reads "Test. Please ignore" was purely a test message (I have been having problems with the site). Ignore that message (and only that message).
Which is right
it is a pity that my daughter failed this year or it is pity that my daughter failed this year