When should I use ～ている vs. ～ています?


The book says use `～ている` for a) an action in progress and b) a past event that
is connected with the present, and it has examples like `スーさんは本を読んでいます`, and
all the examples are using `ています`. But when I look it up in the dictionary, it
says `その本なら読んでいるよ`. So when do I use `～ている` and when do I use `～ています`?




~ています is simply more polite than ～いる. You would use ～ています with strangers,
people you just met, in a business situation, or just to be more polite. ～ている
would be used in writing, or in casual situations.




~ています is simply more polite than ～いる. You would use ～ています with strangers,
people you just met, in a business situation, or just to be more polite. ～ている
would be used in writing, or in casual situations.

