Question

where is this pencil怎么回答？

Answer 1

回答where的句式，一般使用一些方位介词，如in on at 等等，比如The pencil is in the box.具体情景使用具体介词。

Answer 2

Where is this pencil?
这支铅笔在哪里？
根据实际情况，可以这样回答：
It is on the desk.
It is in the box.

Answer 3

where is this pencil？

翻译过来就是在问“铅笔在哪里”，可以回复“sorry，I don't konw.”

Answer 4

here is it.