had he been here yesterday,he would attend.

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had he been here yesterday,he would attend.
为什么是had了,后面是would do而不是would have done

这个是错综时间虚拟语气条件句,先说倒装,当虚拟语气的条件句用到had done(对过去）或were（对现在或将来）或should（对将来）时要省略if,把前面的三种情况的任何一种置于句首倒装,你的句子实际是：If he had been here yesterday倒装之后就变成你所写的了,而错综时间是主句的所要表达的时间和从句所要表达的时间不同时,就会产生了,你的句子要表达的是如果过去他怎么样,他现在就会怎么样,所以主句应该要用对现在的虚拟would/should/might/could +V动词原形

had he been here yesterday,he would attend. he had been here,everything would have been all right ___,everything would have been all right.A.he had been here He has been here ___since yesterday.___ He had been sick before yesterday noon. If my lawyer had been here last Saturday,he would have preve he said he had been waiting here for ( ). He has been here since yesterday.(同义句)He has been here for _ He must have been here yesterday,( 改为反义疑问句 he has been here since yesterday对划 He has been here since yesterday.(对划线部分提问) Who( )here yesterday?Lilong,( )he had something to do.