L1 Burkinabe speakers generally become nativelevel speakers of French by adulthood, as French is the official second language of their country and is used in their daily life, but learn English as a foreign language is later in their lives.
as their L2 and L3 contain grammatical markings that are sometimes more similar to each other and sometimes more similar to the L1, such as with progressive/perfective constructions, it is unclear how this multilingual environment will influence the acquisition of such constructions.