The Thomas _is having/are having/were having/was having__ dinner when l phoned them last night.

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• The Thomas _is having/are having/were having/was having__ dinner when l phoned them last night.
• The Thomas _is having/are having/were having/was having__ dinner when l phoned them last night.
• When someone knocked at the door,I was having dinner.可不可以把when放在I的前面呀?这样意思也一样?
• one day when they are having dinner我猜这个带when可能表示进行时所以用having,但下一句i am very busy,when people go out to dinners这里也是when开头为什么没用ing的进行时呢,还有我知道有时候dinners与a dinner意思一样,如go out to dinners和shall we go out to a dinner tonight?所以我认为one day when they are having dinners对吗?如go out to dinners和shall we go out to a dinner tonight？所以我认为one day when they are having dinners对吗？dinner加s对吗请求大家帮助！