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Common collocations with speculate in American Collocation

speculate verb

US /ˈspekjəˌleɪt/

without any purpose or control

idly
wildly

Newspapers were speculating wildly about who this mysterious woman was.

only

merely
only

As to why this is so, we can at present only speculate.

by many people

widely

It is widely speculated that a second pipeline will be built.

cause
future
nature
origin
possibility
reason

It is not our place to speculate on the causes of such a change.

Almost exactly 500 years ago, Leonardo da Vinci speculated about the possibility of flying machines.