CHENNAI: For more than three years now, scientists have been saying aspirin, the low-cost painkiller that also prevents heart diseases, can kill cancer cells. Just that they didn't know how.
http://m.timesofindia.com/city/chennai/iit-madras-scientists-discover-how-humble-aspirin-kills-mighty-cancer/articleshow/58057378.cms
What is the grammatical form and function of "that"?
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“That” belongs to the category ‘subordinator’, and its function is that of ‘marker’. It is introducing the declarative content clause “they didn’t know how”.
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“That” belongs to the category ‘subordinator’, and its function is that of ‘marker’. It is introducing the declarative content clause “they didn’t know how”.