How do I say "Can I help you?" in Japanese?
This summer I am going to Japan, and staying with my boyfriend's family. I want to be able to help his parents around the house. (ex: after dinner, I want to help clean the dishes...)
So how can I offer my help and say "Can I help you?" etc.

Question

How do I say "Can I help you?" in Japanese?
This summer I am going to Japan, and staying with my boyfriend's family. I want to be able to help his parents around the house. (ex: after dinner, I want to help clean the dishes...)
So how can I offer my help and say "Can I help you?" etc.

Answer

「手伝います」（てつだいます／tetsudai masu）= I help you. (a little polite)
「お手伝いします」（おてつだいします／otetsudai shimasu）= I help you. (more polite)

「手伝いましょうか？」（てつだいましょうか／tetsudai masyou ka）= Can I help you? (a little polite)
「お手伝いしましょうか？」（おてつだいしましょうか／otetsudai shimasyou ka）= Could I help you? (more polite)

「手伝わせてください」（てつだわせてください／tetsudawasete kudasai）= Let me help you.
「お手伝いさせてください」（おてつだいさせてください／otetsudai sasete kudasai）= Let me help you.(polite)

「私にそれ、やらせて頂けませんか？」（わたしにそれ、やらせていただけませんか／watashini sore, yarasete itadakemasen ka）= Could you make me do that?
〔 following the words of "私にそれ、", it is better that you are pointing the thing.
# you can change words sorting into [watashi ni yarasete itadake masen ka? sore]. following the words of [sore], it's better that you're pointing the thing.　〕

Answer

"いらっしゃいませ" is used by salesperson when someone come in a shop.

Answer

いらっしゃいませ
i ra shya i ma se

Answer

いらっしゃいませ