当when为 当……的时候的意思时造一个句子 当when为 突然的意思

when i get home.当我回家的时候.when it arrived at london.当它到达伦敦时.
I had just walked out of the kitchen when someone knocked at the door.我刚从厨房出来,（突然）有人敲门.
She was thinking of her friend when Tom called her.她正在想她朋友的时候Tom（突然）叫了她一声.
one person wants out,while the other wants the relationship to continue.一
人想就此了断而,另一人想继续保持这种关系.
Some　people　waste　food　while　others　haven't　enough.
有些人很费粮食,然而有些人却吃不饱
The　son　was　having　a　good　meal　at　home,while　the　parents　were　working　in　the　fields.
儿子在家吃好饭而父母却在田里辛勤劳作.