On the tube or in the tube?
Solution 1:
You haven't told us what precisely you mean by "the tube". Here is an example:
You can see that, if you wrote instructions in (inside) this particular tube, no-one would be able to read them.
You haven't told us what precisely you mean by "the tube". Here is an example:
You can see that, if you wrote instructions in (inside) this particular tube, no-one would be able to read them.