แต่

[dtɛ̀ ſhǎn măi yɔk pai]

But I don't want to go (situation: expressing reluctance)

ใช้ [ไม่อยาก] = don't want to

[dtɛ̀ thəə sŭay mâak]

But she is very beautiful (situation: complimenting)

ใช้ [สวย] = beautiful, often used with people

[dtɛ̀ raa gàw mâak]

But the price is very cheap (situation: bargaining)

ใช้ [ราคา] = price, often used with bargaining