If you had come here early yesterday ,you could have watched

If you had come here early yesterday ,you could have watched If it had been fine yesterday,we could have watched that air 英译汉：Had you come yesterday,you would have seen him. could you please come here ( )( ) ( You should come here early.同义句 用所给词组成句子have ,come,early,you,do ,so,not,come,to,here. you could have done better if you ----more time1had 2had had if you have come this far,maybe you could come a bit further If you had come是不是等于Had you come Had you come yesterday,you would have seen him.这句话有没有语法错误,我认 If you had come earlier, you would have met him. 后半句不要have可以 If I had known that,I could have helped you.had和known怎么都是过去式