Anonymous I did not go to school because I had an headache This one is better; the first sentence tells us that the headache was finished before you decided not to go to school. Anonymous In the second sentence both actions take place at the same time and the action of having an headache is not finished That's right: a good reason to stay home.
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Anonymous I did not go to school because I had an headacheThis one is better; the first sentence tells us that the headache was finished before you decided not to go to school.
AnonymousIn the second sentence both actions take place at the same time and the action of having an headache is not finishedThat's right: a