1. You use Although to introduce a subordinate clause which contains a statement that makes

2. Backshift (or Backshifting) may also occur when a verb in a subordinate clause is …

3. You use Although to introduce a subordinate clause which contains a statement that contrasts with the statement in the main clause

4. You use Although to introduce a subordinate clause which contains a statement which makes the main clause of the sentence seem surprising or unexpected

5. Because (conj.) late 14c., from phrase bi cause, introducing a subordinate clause or phrase, "by cause, for the reason that," from by (prep.) + cause (n.)

6. Because is a subordinating conjunction, which means that it connects a subordinate clause to an independent clause; good style dictates that there should be no comma between these two clauses

7. When we place the Adverbial subordinate clause in the middle of a sentence, we put commas (,) before and after it, in order to divide it from the rest of the sentence.