为什么要用have,不能用has呢?

为什么要用have,不能用has呢? somebody has taken my watch为什么要用has 不能用was呢 Does your father have many friends?为什么不能用has,而用have? “TOM must have goodhibits.TOM是第三人称,为什么不能用“has”而用“have” does he have any apples? 为什么不能用has The house whose roof was damaged has now been repaired .为什么要用whose啊?为什么不能用which呢 My life has change a lot in the past few years.为什么用has,不能用have, He has no sister=He does‘t have any sisters 他没有姐妹.为什么要用any sisters不能用 He does't have sister 在英语时态中,为什么完成时中只能用have/has/had而不能用be 动词? these have not had any effect这里为什么用these呢?能不能用this.these指的是Jasper has put up“no pthese指的是Jasper has put up“no parking”signsoutside his gate 这件事 The sun has risen ,let’s go to have a barbecue.为什么一定要用现在完成时,不能用一般现在时?The sun has risen ,let’s go to have a barbecue.为什么一定要用现在完成时,不能用一般现在时? Despite all that has been said,the tourists have been picking leaves.这个句子的despite可以用even 为什么,不能用even so呢?都是尽管如此的意思,各自的用法是什么呢? who have got和who has got区别who have got和who hase got区别为什么有时候用who have got有时候用who has got比如who has got some small change?不能用have got吗 完成时态的结束性用法为什么不能用had而必须用have或has加过去分词呢 例题 Lily doesnt want to go beijing .Because she ( ) Beijing three times .A.has gone to B.has been to C.had been to D.had gone to为什么选B 不选D 26.neither the teacher nor the students ¬¬_______ in the experiment.26.neither the teacher nor the students _______ in the experiment.A.has succeeded B.have succeeded C.has achieved D.have achieved这里为什么要用have不能用has? 为什么不能用that呢 what about eating out this evening,为什么要用eating呢为什么不能用eat呢 为什么The girl has long hair.不能用has?