all i have to do is to do sthall i had to do was to write a story and present it为什么write不改为wrote,前后时态一致?

all i have to do is to do sthall i had to do was to write a story and present it为什么write不改为wrote,前后时态一致?
all i have to do is to do sth
all i had to do was to write a story and present it
为什么write不改为wrote,前后时态一致?

all i have to do is to do sthall i had to do was to write a story and present it为什么write不改为wrote,前后时态一致?
这里主要有两个语法现象:
1.all I have to do is 的后面需要跟不定式,即to加上动词原型.
这个原型不受前面的have的时态的影响,不管是have,had,will have,had had等等,后面的只能是is加不定式；也不受这个is的时态影响,不管是is,was,will be,had been,is后面的只能是不定式.这个句子里面需要注意时态关联的是have和is需要一致,他们跟后面的不定式无关.
2.就是不定式的语法了,不定式通常是to+动词原型,而在本题的这个句型里面,更多的时候to可以省略,于是你的句子可以改写成：All I had to do was write a story and present it.google搜索的结果也表明人们更习惯于省略to.

我的天，to要么作不定式，后面加动词原形；要么作介词，后面加动名词，打死了也扯不到像wrote似的过去分词啊！这里的to是作不定式，因此填原形！

这不是 to do 不定式吗 to+动词原形 那个15级的说的很清楚，但我从没听说过 主语从句 这个名词 （补充一下哈，若to是介词，to+v.ing 表语是 be（系）动词后面的成分）

to write是动词不定式
动词不定式的构成 是 to+动词原形
All I had to do 是主语从句，had是从句中的谓语动词，要有时态变化
was是系动词，整个句子的谓语
to write a story and present it 是表语，动词不定式作表语，动词不定式中的动词要用原形