rapport d'activité

Nouns in French have a gender (masculine or feminine). 'Rapport' is masculine, so it takes masculine articles and adjectives. 'Activité' is feminine, taking feminine articles and adjectives.

Le rapport est intéressant. (The report is interesting.) La nouvelle activité. (The new activity.)

The preposition 'de' or 'd'' (d' before a vowel) is often used to connect two nouns, where the second noun specifies or describes the first. Here, 'd'activité' specifies the type of report.

Un verre d'eau. (A glass of water.) Le livre de Marie. (Marie's book.)

To make a singular noun plural, generally add an '-s' to the end of the noun and change the article accordingly. For 'rapport d'activité', both parts need attention for pluralization if talking about multiple reports.

Un rapport d'activité. (An activity report.) Des rapports d'activité. (Activity reports.)

Adjectives typically agree in gender and number with the noun they modify. If you were to describe the 'rapport d'activité' itself, the adjective would agree with 'rapport'.

Un rapport d'activité complet. (A complete activity report.) Des rapports d'activité complets. (Complete activity reports.)

Possessive adjectives (mon, ma, mes; ton, ta, tes, etc.) agree in gender and number with the noun they precede, not the possessor. So, 'my activity report' uses 'mon' because 'rapport' is masculine.

Mon rapport d'activité. (My activity report.) Sa rapport d'activité. (His/Her activity report.)