1. When a personal verb is a non-personal verb, the subject is usually assumed by the pronoun il or ce, but it has no practical significance. It is only a formal subject, and there are other substantive subjects in the sentence, such as:

He arrived in March. He met with misfortune. )

(The formal subject is il and the substantive subject is un malheur)

2. When infinitives are substantive subjects, there are often formal subjects in sentences.

This is a different answer to this question. This question is difficult to answer.

(the formal subject is ce, and the substantive subject is responsible re à cette question)

3. Nominal clauses guided by "que" are often the substantive subjects of sentences.

I came to celac. Sometimes you can skate on this lake. )

(The formal subject is il and the substantive subject is puisse patiner sur ce lac)

The above is the introduction of "French formal subject and substantive subject". If you want to know more and have plans to learn "French", please click on the right for online consultation and make an appointment for free audition. There are more surprises in online booking.