Informal:
* พูดไทยนิดหน่อย (pùut thai níd nɔ̀i) - This is the most common way to say it and is generally appropriate for casual conversations.
* พอพูดไทยได้นิดหน่อย (pɔ̄ pùut thai dài níd nɔ̀i) - This means "I can speak Thai a little bit."
Formal:
* ดิฉัน/ผม พูดภาษาไทยได้นิดหน่อย (dī chǎn/pʰǒm pùut phāṣā thai dài níd nɔ̀i) - This is a more polite way to say it and is appropriate for formal situations. "ดิฉัน" (dī chǎn) is used by women, and "ผม" (pʰǒm) is used by men.
Even More Polite:
* ดิฉัน/ผม พูดภาษาไทยได้บ้าง (dī chǎn/pʰǒm pùut phāṣā thai dài bâang) - This means "I can speak Thai a bit" and is the most polite way to say it.
No matter which phrase you choose, it's always helpful to be humble and acknowledge that your Thai skills are still developing.
Remember: Thai is a tonal language, so the pronunciation of these phrases is very important. It's helpful to listen to a native speaker pronounce them so you can get the correct tones.