将陈述句变为一般疑问句时，需要将 系动词、助动词或情态动词移至句首，并在句末加上问号。以下是一些具体的例子：

陈述句: I'll go to the History Museum this afternoon.

一般疑问句: Will you go to the History Museum this afternoon？

陈述句: These are yours.

一般疑问句: Are these yours？

陈述句: This is a teacher's desk.

一般疑问句: Is this a teacher's desk？

陈述句: He likes English.

一般疑问句: Does he like English？

陈述句: It is rainy today.

一般疑问句: Is it rainy today？

陈述句: Can Tom play the piano？

一般疑问句: Can Tom play the piano？

陈述句: I go to school on foot.

一般疑问句: Do you go to school on foot？

陈述句: She can speak French.

一般疑问句: Can she speak French？

通过以上例子，可以看到，将陈述句中的系动词、助动词或情态动词提前到句首，并在句末加上问号，即可将其变为一般疑问句。希望这些例子能帮助你更好地理解和掌握这一语法现象。