Americans only use "practice" for both noun and verb, so I'll leave that aspect of your question to others. People are practising cricket (Or: Cricket practice will be held ) this S unday at 9 am at the Student Recreation Complex ground s *. Anybody who is interested in practising the game before the (omit) next week 's tournament is invited to join the practise match.
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In general, the rule says that when you are considering subject-verb agreement you should ignore prepositional phrases. For example: "The age of the novels is surprising." "of the novels" is a prepositional phrase. "The age" is singular subject so the verb will be singular "is". There is an exception to that rule where we should not ignore the preposition ph