How do you say are very welcome in Thai?

There are a few ways to say "you're very welcome" in Thai, depending on the context and level of formality:

Formal:

* ยินดีมาก (yin di mahk) - This is the most common and polite way to say "you're very welcome" in any situation. It literally translates to "very happy."

Informal:

* ไม่เป็นไร (mai pen rai) - This means "don't worry" or "it's nothing," and is often used in informal settings to express that you're glad to help.

* ไม่มีปัญหา (mai mee pan ha) - This means "no problem" and is also a casual way to say "you're welcome."

* ไม่เป็นไรเลย (mai pen rai loi) - This is a more emphatic version of "mai pen rai," meaning "don't worry at all."

Note: Thai language often uses different tones for different meanings. Make sure you use the correct tone when speaking, as it can completely change the meaning of a word.

You can also add "ครับ" (krap) or "ค่ะ" (kha) at the end of your sentence to show politeness, similar to "sir" or "ma'am" in English. These are used by men and women respectively.