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.

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(Preposition)
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.
(Conjunction)
He has been working in this office since last month.
(Preposition)
Since you are still physically weak,You should not work so hard(Conjunction)