I visited London last winter and saw the Big Ben,which is very old but it still runs.因为大本钟现在也在工作，所以尽管主句是过去式，但从句仍用一般现在时态。请参考！
这是长城，它非常漂亮，它既长又古老，我们都喜欢它。
This is the Great Wall, it is very beautiful .It is long and old .We all like it.
它是一个很古老的钟。英语：It is / was an very old clock.It is/was an ancient clock.
就是英语书。和英语有关的字。
It's very old and very tall.或It's not only very old but also very tall.
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十米之上
