Countries that were colonized by Britain often had their native culture and language suppressed and English language imposed. Especially in cases where the colonized country consisted of several nations with different languages, English has turned into a de facto common tongue, in some cases replacing parts of the native language and introducing English words for culturally imported things and concepts.
The result, after many years, is the fluidity you have observed, where even in the case a conversation is in a native language, English words, phrases and sentences are mixed in.
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