ever since she came to china,为什么came不用第三人称单数形式呢?

这里ever since 引导过去发生,用一般过去式
她是过去来到中国的.发生在说这个话之前.��ȥʽ�Ͳ��õ����˳Ƶ����𰡣���ȥʱû�е����˳Ƶ����ֻ��һ������ʱ���е����˳Ƶ���she has already been to many places of interest ever since she came to china.������cameһ��Ҫ��һ���ȥʽ����Ȼ�������ò�״��Ӿ���÷��������������ʱ���Ӿ�һ���ȥʱ���Ƕ��壬��ס�ͺ��ˡ�