when：in/at/on+which(時(shí)間點(diǎn)）
where：at/in..介詞+which（place）
why：for +which（ the reason）
關(guān)鍵還是要看語(yǔ)意和先行詞是什么,用什么介詞.能告訴我區(qū)別嗎when = 在什么時(shí)候，where = 在什么地方，why = 為什么原因，你看先行詞是什么，分析分析句子的意思。比如：Tell him to go to the classroom where we often have our English class 這句話。classroom就是先行詞，后面你可以看成 we often have our English class in the classroom。in the classroom=in which=wherePeople will always remember the time when Hong Kong and Macao returned to our motherland .Hong Kong and Macao returned to our motherland+in the time 。in the time=when恩...我今年高三，這些就是我們老師平時(shí)上課講的。你不懂還可以追問(wèn)噢~親~~把分給我吧~~謝謝咯~~~~>.<~~~