Firstly - во-первых, secondly - во вторых, thirdly - в-третьих. Firstly means to start with, secondly - as the second item in a list, thirdly - as the third item on a list. Firstly, the film's interesting, secondly, it's free of charge, thirdly, it's at home.
36-015 Английские связующие слова-линкеры: "FIRSTLY, SECONDLY, THIRDLY"
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