'Central bank securities purchases have provided meaningful support to the economic recovery,' he said adding later that, 'we should not rule out the further use of such policies if economic conditions warrant.'
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I am confused by the use of nouns or verbs in this context. I wonder if you could explain?
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Warrant is transitive, but in this case the object it is missing. This is an example of ellipsis.
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http://en.wiktionary.org/wiki/ellipsis
The omission of a grammatically required word or phrase that can be inferred.
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So in this case we have the omission of 'it' which is not very helpful, because you always have to think what 'it' is and sometimes 'it' is nothing.
'Central bank securities purchases have provided meaningful support to the economic recovery,' he said adding later that, 'we should not rule out the further use of such policies if economic conditions warrant it.'
So what is 'it'?
'Central bank securities purchases have provided meaningful support to the economic recovery,' he said adding later that, 'we should not rule out the further use of such policies if economic conditions warrant central bank securities purchases.'