The pen is good to write(要加介词with吗?)

The pen is good to write(要加介词with吗?) The pen is good to write为什么要加with a chair to sit on;a pen to write with.这种怎么判断最后要不要加介词? ①The pen is nice to write with .②The ice is thick to skate o Could you lend me a pen to write with?为什么要加with The old pen is broken,I'd like ____ one to write with A.the 1.Who was the first one to arrive?2 pen to write with 第一个介词呢 为什么This pen is easy to write with.可以变成This is an easy pen to i think the pen is easy to write是否正确, （I have a pen to write with）句中 为什么加 with I have no pen to write with A pen is used to write with为什么要加个with呢?!