Hello Yucheng.
Quote:Kinds of films or Kinds of film, which one is right or both are correct?
This is complex, and there are differing opinions, but here is a simplified summary:
If the idea is of one sort, you'd use, "kind of idea." If they are of more than one sort, you'd use, "kinds of ideas."
single idea
It's a thriller - not my favourite kind of film.
multiple idea
Thriller, romance, musical, biographical - all these kinds of films are made in Hollywood.
Quote:Morning exercises or morning exercise, which one is right or both are correct?
Again it depends. The word "exercise" can have a specific meaning and also a general meaning.
(1) specific
Something done or performed as a means of practice or training - exercises for the piano, physical exercises, language exercises.
Physical exercises may be organised, and may take place in a gymnasium. Here is an imaginary series of exercises: Scissor jumps, running on the spot, weight lifting, pressups, situps.
(2) general
Bodily or mental exertion, esp. for the sake of training or improvement of health - Walking is good exercise.
It is good for your health to take some exercise.
That man is fat. I bet he doesn't take any exercise!
So both those examples could be right.
Quote:'The station was nearer than I thought'. I rewrite it
--> The station wasn't as near as I thought
--> The station wasn't as far as I thought
Which one is right?
The station wasn't as far as I thought.
You have changed 'the station was' into its opposite, 'the station wasn't [=was not]', so you must also change the adjective 'near' (of which 'nearer' is the comparative form) into its opposite 'far'.
Best wishes from
Contrex