dondondonki0390

[summer token]

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[next jacinth]

Hey Dondondonk
In your sentence "Il oublie toujours de faire ça" the "de" is retained because it is part of the original verb phrase "oublier de". The verb "oublier" is always followed by "de" when it links to an infinitive verb, in your case it’s "fermer"

When you replace the clause "de fermer la porte à clé" with "ça" as you did, you still need to keep "de" because it's tied to the verb "oublier". The structure "de faire ça" is correct because "de" belongs to the verb "oublier" in this construction

Does that answer your question? 😅

[woeful vine]

Ohh

so here is like verb with preposition de + an infinitive + object pronoun?

https://www.lawlessfrench.com/grammar/verbs-with-de/

[next jacinth]

In our case it needs to be a verb that uses “de” to link to an infinitive verbe, in your case that infinitive verb was fermer which is something you do (faire). Another example could be "Elle rêvait de manger des bonbons" > "Elle rêvait de faire ça"

[woeful vine]

so ça replaces a noun in this case?

faire replaces the action fermer

[next jacinth]

The pronoun "ça" replaces the entire infinitive phrase "manger des bonbons" So, "ça" stands in for the action or idea of "eating candy".

The structure "rêver de" (to dream of) requires "de" before an infinitive just like oublier does. When you substitute the specific action "manger des bonbons" with "ça" the "de" is retained as part of the verb phrase "rêver de". That’s why "ça" in this context replaces "manger des bonbons"

As for faire, it’s not replacing anything. You’ve added it into the sentence to indicating that you’re doing whatever “ça" is replacing

[woeful vine]

Ohhhh

Okay, so for structure like verb + de + infinitive, de must be retained. Ça could be used to replace an infinitive clause.
Therefore, de faire ça = to do this (?)

[next jacinth]

You got it
Here’s another example
Elle a décidé de partir tôt > elle a décidé de faire ça;)

Courtney a peur de parler en public, Courtney a peur de faire ça

you got it now

[woeful vine]