Learn French: Anticiper sa position est crucial pour la stratégie. - Anticipating his position is crucial for the strategy.

In French, when an action is the subject of a sentence, you must use the infinitive (like anticiper), never the present participle. While English uses the -ing form (a gerund) as a noun, French structures it essentially as 'To anticipate his position is crucial'.

How do we know to use the masculine singular form of crucial when the subject is an action?

When an infinitive phrase like Anticiper sa position acts as the subject of the sentence, it doesn't have a grammatical gender. In French, grammar defaults to the masculine singular form for the adjective in these cases, which is why it is crucial and not the feminine cruciale.

The English translation says 'his position'. Since it's 'his', shouldn't it be son position?

No, because French possessive adjectives agree with the noun being owned, not the owner. Since the word position is feminine, you must use sa. Because of this rule, sa position can actually translate to 'his position', 'her position', or 'its position' depending purely on the wider context.