如果你是要quot（引用）进来，加上引号的话，就不用变时态。如果是想用那句话，就要配合了。比如，in his latest song “Let me go”，Tom expressed his melancholy by singing "I am the only in the sea of solitude"。但是如果你觉得某句话很有哲理，又是和过去的时态有关，就配合。My father used to tell me that one could never stop working hard ....
