I know that "It is fun to play tennis" is more preferred than 'To pay tennis is fun', but wonder if there is any difference in the meanings or nuances.
Hello, Reo, and welcome to the Grammar Exchange.
Those two sentences, "It is fun to play tennis" and "To play [not "pay"] tennis is fun," are equivalent in meaning, and the former is traditionally analyzed as a grammatical transformation of the latter.
It is rare for infinitival clauses to appear in subject position, and it is not advisable for ESL learners to attempt to use them thus, since awkwardness is generally the result. Use -ing subjects instead: "Playing tennis is fun."
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