yeah.. for me, apostrophe is very important because it shows possessiveness.. and if there is no apostrophe, we cant distinguish whether were using the plural or singular form of the [STRIKE]verb[/STRIKE] noun..
for example:
Teacher's lesson - singular form
Teachers' lesson - plural form
Neither makes sense:
- Ten years jail: What kind of jail is a ten years jail?
- Ten years' jail: How can a jail belong to ten years?
It should be "ten years IN jail." Maybe this is just another difference between British and American English.