自己写了一个英语句子，请高手帮忙看有什么语法错误没。

Question

One day, a student asked teacher a question:“why friend can easily turn into opponent, but opponent is hardly to turn into a friend”.The teacher answered:“because pull down a house is easier than erect a house”

Answer 1

正确说法如下：
One day, a student asked the teacher such a question:“why a friend can easily turn into an opponent, but an opponent can hardly turn into a friend?” The teacher answered: “because pulling down a house is easier than erecting one.”

1、单数可数名词前面不要忘了加a/an。
2、but连接的两个成分应该是并列成分，如果前面是句子，后面也应该是句子。是句子就应该有谓语动词，所以to turn应该改成can turn。
3、pulling down a house是主语，erecting one (a house)是表语，都应该用非谓语动词的形式（具体而言，都要用to do 或doing的形式），而不能用谓语动词的形式。

Answer 2

asked teacher

这个teacher要加修饰的 改成 his teacher 或者the teacher

“because pull down a house is easier than erect a house”
pull改成pulling
erect改成erecting

“why friend can easily turn into opponent, but opponent is hardly to turn into a friend”

friend改成friends
opponent改成opponents

OK啦~

Answer 3

why friends can easily turn into opponents, but It is so hard for opponents to turn into friends.

because pulling down a house is easier than erecting a house.

Answer 4

One day, a student asked his teacher a question:“why friends can easily turn into opponents, but opponents can hardly turn back friends again”.The teacher answered,“because pulling down a house is much easier than rebuliding one”.希望回答对您有所帮助。

Answer 5

One day, a student asked his teacher a question:“why friends can easily turn into opponent, but opponent is hardly to turn into a friend”.The teacher answered:“because pull down a house is easier than erect one”

Answer 6

不能用冒号，英语中没有冒号，要用逗号，其他就是楼下所说的那样