为什么中文网页，网页的一部分在有的电脑上显示为英文？

网站可以根据你的IP地址来判断是哪个国家的，不是国内的话可能就redirect到英文网页。可能是你的浏览器用了代理服务器。

在英语中，一句话可以有两种或多种不同的时态吗？

可以的
你看到的不同时态，他们并不是并列的关系存在的
the first people who were like ourselves lived so long ago that even their sagas，这里的过去时是在定语句中的时态，补充说明the first people的情况，跟主句的关系是补充，时态是单独考虑的，它应该是怎样的时态就用什么时态
the first people...are forgotten是主句，它跟分句的时态没有关系，所以不会有冲突，根本来说就是两个部分，把分句拿开，句子仍然成立，分句是添加的用来补充的部分
不管是主句，还是分句，单独的考虑它们所用的时态就好
其实，这里关键的就是分清主句和分句了

最喜欢的一首歌 英语作文 加翻译

My Favorite Song
I like songs.Everyday when I get home from school, I turn on my MP3 to enjoy them.But of all the songs,I like English classic songs best,especially the one "Take Me to Your Heart".Its really a nice thing to listen to it.Its melody is wonderful and its words are moving.The song is about the love between a boy and a girl,the boy loves the girl so deeply that he can even give his heart to the girl.Hower the girl seems not to understand him.How moving the story is! Whenever I hear the song,I am affected.I wish I were the boy in the song.