How to say “I let him do X to me”?


If I said “he did X to me,” I would probably say 彼にXされた. On the other hand, if
I said “I let him do X,” I would say 彼にXさせた. But if I were to combine the two
and say 彼にXさせられた, that would mean “he made me do X,” correct? How then would I
be able to say “I let him do X to me”?

EDIT: for a more concrete example, say I was in a class and we were made to
form groups. Either we chose our groupmates ourselves, or we let the teacher
group us. Say I let the teacher put me in a group: how would I say “I let the
teacher put me in a group?” (I imagine saying “the teacher put me in a group”
would involve passive voice, me being the narrator and therefore the subject
of the sentence).




I assume the question used the versatile word "let" to mean the teacher
becomes the decision maker by choice, and _not_ by command, which is otherwise
rude.

Personally, I would avoid the direct translation. The following suggested
expressions use `私のグループは` that refers to the group I would be in (translated
as "my grouping"); not the literal "my group", which is yet to exist in this
context.

> A. 私のグループは 先生に決めてもらった｡  
>  A. [I] had [my] teacher decide for my grouping.
>
> B. 私のグループは 先生に決めてもらう方にした｡  
>  B. [I] opt for the choice that [my] teacher would decide for my grouping.

`A` is the straightforward, passive voice. The phrase `先生にきめてもらった` is probably
the shortest phrase one can use readily to describe that "the teacher decide
(do) the group (X) for me".

`B` is the alternative expression made by modifying `A`, which turns the
passive voice to not-so-active voice. As a result, `B` would be perceived less
straightforward, but would appeal the speaker as slightly independent (on the
surface only, because the teacher is still the decision maker by choice).

Note that `B` will make sense only when "the teacher would decide my grouping"
is available as a choice, due to the phrase `〇〇方にした` being used to refer "that
choice". In contrast, `A` will make sense regardless of that is a choice or
not.

Then again, these expressions may vary when describing the "do": If the groups
were already formed, the teacher would choose (選ぶ) which group the student (I)
would be in; else if no groups were formed yet, the teacher would decide (決める)
how the groups would be formed, or decide which and which students would be
put into the groups.

