~ても構わない
It is acceptable even if this happens
You’ll be able to give or confirm permission while emphasizing that the situation causes no problem.

お皿洗いは明日の朝になっても構いませんよ。
osaraarai wa ashita no asa ni natte mo kamaimasen yo.
What do you think this sentence means?
It is completely fine even if you wash the dishes tomorrow morning.
Indicate that a situation causes no problem
~ても構わない (or politely ~ても構いません) means “it doesn't matter if” or “it is fine even if.” It gives permission or confirms that a condition poses no problem or concern.
このペン、使っても構いませんか?
kono pen, tsukatte mo kamaimasen ka?
Do you mind if I use this pen?
少し高くても構わないから、いい物を買いたい。
sukoshi takakute mo kamawanai kara, ii mono o kaitai.
I don’t mind if it is a little expensive; I want to buy something good.
Pair a て-form with 構わない
Conjugate a verb, adjective, or noun into its て-form (or で-form for nouns and na-adjectives) followed by 構わない (or 構いません in polite speech).
急ぎませんから、返事は後になっても構いませんよ。
isogimasen kara, henji wa ato ni natte mo kamaimasen yo.
There is no rush, so it is fine if your reply comes later.
「すみません、この窓を開けても構いませんか。」
“sumimasen, kono mado o akete mo kamaimasen ka.”
“Excuse me, would it be all right if I opened this window?”
お支払いはカードでも構いません。
oshiharai wa kaado de mo kamaimasen.
You may also pay by card.
狭くても構わないから、駅に近い部屋を探している。
semakute mo kamawanai kara, eki ni chikai heya o sagashite iru.
I’m looking for a room near the station, and I don’t mind if it’s small.
7 more examples in the grammar path — free for a limited time.