Question

1. I brushed my teeth as I took a shower.

2. I brushed my teeth because I took a shower.

3. I brushed my teeth while I took a shower.

4. I brushed my teeth taking a shower.

(Does #1 mean #2 or #3? Is #3 the same as #4?)

Answer 1

1 and 3 are correct.

Neither 2 nor 4 make much sense. (Your teeth aren't taking a shower.)