Is it true that when using the expresseion, the comparative form is not allowed.
e.g. Compared with the traditional vehicle, the all-electricty car is much more environment-friendly.
Besides, which expression is right,
the traditional vehicle / the all-electricity car
the traditional vehicles / the all-electircity cars
traditional vehicles / all-electricity cars
a traditional vehicle / an all-electricity car
Besides, how do I judge the Adj. is a singular form or a plural form?
THough I know some "the adj" is singular form but it seems some are plural forms, aren't they?