Yesterday is very happy.请问这句话错了没

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Yesterdayisveryhappy.请问这句话错了没Yesterdayisveryhappy.请问这句话错了没Yesterdayisveryhappy.请问这句话错了没错了yesterday不能

Yesterday is very happy.请问这句话错了没
Yesterday is very happy.请问这句话错了没

Yesterday is very happy.请问这句话错了没
错了yesterday不能做主语