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...bucause their families died.这句哪里错?

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...bucause their families died.这句哪里错?
used to;get used to;be used 如何使用?
...bucause their families died.这句哪里错?
1.families → family
family如果指“家人”时,它是一个集体名词.即它不用复数形式,但是表复数概念.
如:My family are all there.我的家人们都在那儿.
2.其意思和用法如下:
1)used to do sth,意思是“过去常常/曾经...”.
如:I used to be a teacher.我过去曾经是一名老师.
I used to get up early.我过去常常早起.
2)get used to (doing) sth = be used to (doing) sth,意思是“习惯于(做)某事”.
如:I get/am used to getting up early.我习惯于早起.
I get/am used to his hairstyle.我已经习惯他的发型了.
3)be used to do sth = be used for doing sth,意思是“被用来做某事”,句子为被动语态.
如:The knife is used to cut apples.
= The knife is used for cutting apples.
这把小刀是用来切苹果的.