请教几个语法题1.Their friendship dating back to childhood is true.其

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请教几个语法题
1.Their friendship dating back to childhood is true.
其中dating back to childhood 在句子当中做什么成分?请举一个类似的例子.
2.E-shopping,when properly done,can save us a lot of time and money.
其中when properly done在句子当中做什么成分?请举一个类似的例子.

1、dating back to childhood在句子中做定语,修饰“their friendship"
类似的还有：Their cooperation built on the basis of faith will be successful.这项建立在信任基础上的合作会取得成功.
2、when properly done在句子中做状语
类似的如：The teacher,when recovered from the illness,will come back to school as soon as possible.当这位老师从疾病中恢复以后,会尽快回到学校.

请教几个语法题1.Their friendship dating back to childhood is true.其请英语高手翻译并分析语法：Dating back to a perpetual changing moment that 英语口语According to you,what is true friendship? Memories go back to childhood! True friendship is Yongming injuries.. 这句话里Dating back to Dating back to the Beisong Dynasty 翻译 Dating back to 300 year ago,the house is well-preserved. True friendship is like sound health.,______（其价值）is seldom k True friendship is worth more than money true love is friendship caught on fire how is childhood in america similar to childhood in china