Why is the verb conjugated to え-form?


> 選べなかったら俺ん家来れば？

Translation: If you don't like your choices, why not live at my place?

What I'm particularly confused about is the verb being in え-form. As far as I
know, one usage of it is to give commands (imperative), but if that's the case
I don't get why it's used here.




EDIT: Now that it's clearer that you're asking about the 選べ rather than the
来れば, ignore the next paragraph and skip to the end.

While え-form can indeed imply imperative, if it's ～えば then that's a
provisional ("if") form, i.e. it means "If you came to my place ..." and in
this context it's probably been contracted from 来ればいい, which is used to offer
a suggestion. Sort of like "Wouldn't it be good if you ...?" or "You could
always ...".

The 選べ is _not_ an imperative え-form. It is, in fact, part of a conditional
negative potential form. Specifically:

選ぶ (choose) → 選べる (can choose) → 選べない (can't choose) → 選べなかったら (if [you] can't
choose)

