Fill in the blank(s) with the correct word(s)
I _________ to ride the bicycle ________ I was 10 years old.
Learn, though
Learning, as
Learned, before
Learned, when
In the above sentence, the subject is telling us about the exact time he had learned to ride a bike. Thus, the first filler would be the simple past version of the verb learn while the second filler would be a conjunction. Hence, option 4 is the correct answer.