Breakdown of Я укажу путь, а вы должны следовать за мной.
а
and (contrastive)
я
I
вы
you (plural or formal)
должен
must, have to
Questions & Answers about Я укажу путь, а вы должны следовать за мной.
Why does the word путь look like it is in the nominative case here if it is the direct object?
Путь (way/path) is an unusual masculine noun, but because it is inanimate, its accusative form is exactly the same as its nominative form. This is the normal rule for inanimate masculine nouns. What makes путь special, as you are learning in this lesson, is that its other case endings mostly copy feminine nouns.
Why use укажу instead of покажу for showing the way?
While both verbs translate to showing, указать (perfective future укажу) specifically means to point at something, indicate a direction, or give an instruction. Показать is a more general word for displaying something. When guiding someone along a path, указать is the precise verb.
Why is the conjunction а used here instead of и for the English word and?
Russian uses а to show a shift in focus between two different subjects doing two different things. Here, the first part is about what I will do (point the way), and the second part shifts to what you must do (follow). When there is this kind of contrast or role switch, а is the natural choice.
What case is мной and why is it used after следовать?
Мной is the instrumental case of я. When the verb следовать means to physically follow someone, it is paired with the preposition за plus the instrumental case, literally meaning to follow behind or after someone.