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Question:

Of the following versions of this sentence, which one has a complex structure?

A You will have to come back tomorrow since you arrived past the deadline today (b).
Explaination

Version (a) is compound, i.e., two independent clauses (joined by a semicolon). Version (b) is complex, i.e., one independent clause (“You will have to come back tomorrow”) and one dependent clause (“since you arrived past the deadline today”) connected and introduced by the subordinating conjunction “since.” Version (c) is simple, i.e., one independent clause, including a compound predicate (“arrived” and “will have to come back”) but no dependent clause. Version (d) is compound-complex, with two independent clauses (“You arrived late” and “you must come back tomorrow”) and one dependent clause (“which was after the deadline”).