'Climb' is a bare infinitive, a non-finite part of the verb; as such, it has no subject. What has been seen to climb is the popularity of alternative therapies. " No it isn't.
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Nousher AhmedI think, here 'climb' is acting as a verb. Am I right?Right. Not only is it acting like a verb. It is a verb.
Nousher AhmedWhat is the subject of this verb?The thing that is climbing: the popularity of alternative therapies in Australia
Nousher AhmedHow this sentence contains