I
adjective
1
BAD : I wonder if you would be so kind to send me further details and an application form.
GOOD : I wonder if you would be so kind as to send me further details and an application form.
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be kind enough to do sth : 'Would you be kind enough to forward the enclosed documents to Mr Tomkin's new address?'
be so kind as to do sth : 'I wonder if you'd be so kind as to inform your colleagues of the new arrangements.'
2
BAD : All the people he met were very kind with him.
GOOD : All the people he met were very kind to him.
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kind to a person or animal (NOT with ): 'She's always been kind to people less fortunate than herself.'
II
noun
1
BAD : There are many kind of job for people with qualifications.
GOOD : There are many kinds of job for people with qualifications.
GOOD : I enjoy all kind of sport.
GOOD : I enjoy all kinds of sport.
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Kind, sort and type are countable nouns. After many, all, these and other plural meanings, use kinds/sorts/types (WITH- s ): 'These kinds of fruit do not grow in cold climates.'
2
BAD : Imprisonment is not a good way of reducing this kind of crimes.
GOOD : Imprisonment is not a good way of reducing this kind of crime.
GOOD : Imprisonment is not a good way of reducing these kinds of crime/s.
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kind/sort/type of + singular form: 'this kind of envelope'
kinds/sorts/types of + singular or plural form: 'these kinds of envelope/s'
Note that after kinds/sorts/types of a plural form can sometimes sound awkward and careful users generally prefer a singular form.