difficult doing还是todo_difficult doing_difficult doing sth

It's difficult to do 还是 It's difficult doing

It`s
difficult
(in)doing
sth.是做某事有困难，而这道题考得是It`s
adj+to+do+sth
固定形式

find it hard to do还是 doing have a difficult time to do 还是 doing

find it hard to do，比如 I find it hard to study 我发现学习有一定的难度，(这句话只是一句简单句，主谓宾补结构，it做形式宾语，所以要用动词动词原形做宾语补足语。have a difficult time to doing 这里的to是介词，表示的是一种即将去做的事，用动词的ing形式。

find it difficult to do 还是doing sth

have difficult in doing sth
find it difficult to do sth

it is difficult to do/doing it is difficult 后接to do 还是doing

it is difficult/adj.to do sth.

it is difficult to do/doing it is difficult 后接to do 还是doing

it is difficult/adj.to do sth.

difficult 后加doing还是加to do

加to do,It's difficult to do sth,做什么事很难.
比如：It's difficult to say.很难说.It's difficult to explain it away.要把这（凝点）解释掉是不容易的.

difficult 后加doing还是加to do

加to do，It's difficult to do sth，做什么2113事很5261难。比如：4102It's difficult to say.很难说。It's difficult to explain it away.要把这（凝1653点）解释版掉是不权容易的。