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Used with adjectives:
"
The new theory is not believable."
(new, modern, current, general)
"
We are learning economic theories in college."
(economic, scientific, political)
"
They have different theories about what happened."
(different, conflicting, alternative)
"
There are many conspiracy theories out there."
(conspiracy)
Used with verbs:
"
He needs more evidence to prove his theory."
(prove, confirm, support)
"
Let's test her theory to see if it works."
(test, challenge, apply, try)
"
She presented her theory to the board."
(presented, proposed, introduced)
"
They confirmed his theory."
(confirmed, proved, supported, accepted)
"
They have a theory as to how the accident occurred."
(have)
Used with prepositions:
"
He has a theory about why men and women are so different."
(about)
