根据短文内容,判断下列句子正(T)误(F)。( )1. It is Saturday afternoon. ( )2. The boys can see many public signs in the park. ( )3. Liu Tao doesn't know the things about the public signs. ( )4. The man can't see the public signs in the park. ( )5. The man is the park keeper. He wants to take a walk on the grass.