Basic Concepts:  May I do an Action

May I is perhaps the first

Note: 

1) the "ii" form is more common than "yoroshii" and really not any less polite. 

.

Chart: List of Common "temoii" Phrases

V temoii desuka.  // 

V temoyoroshii desuka.  //

"May I .." //

Is it ok to .... //

hairu g1

haitte mo ii desuka.

may I come in?

 kariru g2

(kore wo) karite mo ii desuka.

may I borrow this?

morau

(kore wo) moratte mo ii desuka.

lit.  may I get this from you.  may I have this?

 toru

(kore wo) totte mo ii desuka.

May I take this?

tsukau

(kore wo) tsukatte mo ii (desuka.)

May I use this?

yomu

(osaki ni)  yonde mo ii deska.

May I read that (after you)

taberu

nanika wo tabe te mo ii ...

My I eat something?

daku

kanojyo wo dai te mo ii ...

May I hold her?

yaru

inu ni esa wo yattemo ii ...

May I give the dog "esa"?

ageru

akachan ni (kona) MIRUKU wo agete mo ii...

May I give the baby (powered) milk

tetsudau + ageru

tesudate agete mo ii...

May I give you help

ofuro ni hairu

nyuuyoku suru

ofuro ni haitte mo ii...

"nyu u yo ku"  shite mo ii...

May I enter the ofuro.

May I take a both

SHAWA wo abiru

SHAWA wo suru

SHAWA wo abite mo ii ...

SHAWA wo shite mo ii...

May I take a shower

ojama suru

chotto ojama shitemo yorosii deshouka?

Might I bother you for a moment.

??

hotokoto yokoshii deshouka?

Might I say a few words?

shasshin wo toru

shasshin wo totte mo ii desuka?

Is it ok to take pictures?