Subordinate cojunctions connect clauses of unequal
rank,i.e.independent and subordinate clauses.
Some of the subordinate conjunctions are:
When,because,for,since,so that,if,until,though,although
Some words are used both as conjunctions prepositions:
Suddenly a huge lion appeared before us.

Before the sun rose,they had covered twenty miles.
(Subordinate conjunction connects an independent
and a subordinate clause.)
He cares for none but you.(Preposition)
I called on him but he refused to recognise me.
He has been working in this office since last month.
Since you are still physically weak,You should not work so hard(Conjunction)

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