問句日子(day)應該用When or Which?

唔係幾明你問咩..
不過如果你係想問某樣野係邊日發生,
用when好像不太清晰,,
但勉強也可以用
e.g. Q: When did that happen?
A: It happened last monday.

Q: When did Tom buy the new car?
A: Yesterday.

而用which day就很明確地問別人是在哪天發生
e.g. Q: Which day did that happen on?
A: It happened last monday. (last前面不用加preposition)

Q: Which day did Tom buy the new car on?
A: Yesterday.

總括來說,,
2個字都用得
但用which day會比較清晰~

咁當然係應該用When啦!

應該用when,因為when解做什麼時候,何時。而which就解做哪一個,哪一些。



問句日子:Since when has she taught here?
她從什麼時候開始在這兒教書的?