Understanding いかが in 「先生もお使いになってみたらいかがですか。」


Consider

> 先生もお使いになってみたらいかがですか。
>
> Sensei, how about you try using this?

**Questions:**

  1. The も at the end of 先生も indicates "Teacher, how about _you also_ try using this", correct? (Meaning that before this sentence was uttered, it's likely that it was discussed how other people, besides the teacher, had tried using the thing in question). Is this case?

  2. いかが is translated as "[questionable](https://jpdb.io/vocabulary/2845606/%E5%A6%82%E4%BD%95/%E3%81%84%E3%81%8B%E3%81%8C?lang=english#a)" in its な-adjective form. Under this viewpoint, this sentence means something like

> "Teacher, if you also try and use this, it would be questionable, no?"

What's going on here? Is asking if something is "questionable" just a more
indirect/polite way of asking whether it's good in Japanese?




いかが has two main meanings.

  1. polite saying of どう
  2. seeming to be morally wrong(maybe this is the questionable)

As you wrote, the sentence means "Teacher, how about you also try using this".
1 is used here.  
It has the same meaning as 先生もお使いになってみたらどうですか.

But you can't always use いかが instead of どう.  
I think どうしますか？ can't be いかがしますか？.  
いかがなさいますか？ is much more natural.  
And どうなさいますか？ is good too.  
どう is used almost anytime.  
いかが is tend to be in quite a polite sentence as a whole.

2 isn't used so often.  
When used, it will be almost only in these forms.  
いかがなものかと思う, いかがかと思う, いかがなものだろう  
This isn't casual at all. In conversation, almost all the young people would
use どうかと思う instead.




いかが has two main meanings.

  1. polite saying of どう
  2. seeming to be morally wrong(maybe this is the questionable)

As you wrote, the sentence means "Teacher, how about you also try using this".
1 is used here.  
It has the same meaning as 先生もお使いになってみたらどうですか.

But you can't always use いかが instead of どう.  
I think どうしますか？ can't be いかがしますか？.  
いかがなさいますか？ is much more natural.  
And どうなさいますか？ is good too.  
どう is used almost anytime.  
いかが is tend to be in quite a polite sentence as a whole.

2 isn't used so often.  
When used, it will be almost only in these forms.  
いかがなものかと思う, いかがかと思う, いかがなものだろう  
This isn't casual at all. In conversation, almost all the young people would
use どうかと思う instead.

