I spoke to no one.还是I spoke no one.

speak vi
不及物动词
speak to sb ,对某人说话/指责
write vt vi
write sth 写东西
write to sb 写信给某人
所以这里应该是
I spoke to no one

正确形式应该是：

1）I spoke to no one.
speak这里是不及物动词，所以要加to，应该是I spoke to no one
2）I wrote to nobody.=I wrote nobody.
write to sb 写信给某人，但在经常使用的过程中，这个to可以省略。比如，我们常说Write me please 来借代Write to me please. 另Write me back来指给某人回信。

I spoke to no one.
必须得有这个to。

I spoke to no one.

I wrote to nobody.

speak这里是不及物动词，所以要加to，应该是I spoke to no one

I spoke to no one