could not but后面是do还是to do来着

Question

如题所述

Answer 1

接do。
不得不…
如：
It was cool but not cold. I could not but admit that it was a most pleasant andcomfortable moment.
清凉的水缓缓流过脚面，凉而不冰，我方才觉得这是极为舒美、惬意的时刻。

Answer 2

can not do but do
前面有do（动词） 后面用do
没do加to
例如 can not help but do
have no chance but to do
can do nothing but do