Y It is considered 后为什么能加Incorrect 从语法上怎么解释

Y It is considered 后为什么能加Incorrect 从语法上怎么解释 可以放在句首吗如Yest it is incorrect.这样说是否正确?yet后是否要加逗号 it is considered that... I can make it there by myself . it后加there 语法解释 . It is generally considered u as it is considered 怎解? cut it up get over it 哪个对?谁能从语法的角度解释详细? 英语翻译语法怎么解释it was she 语法怎么解释 英语翻译高中英语语法解释加翻译______ once every two years,whether it is a c It don't rain but it pour.语法上怎么解释,but在这里是连词吗,为什么用don't而没有用do it is believed silly 为什么过去分词后加形容词 Your certificate number is incorrect.Please check it