ข้อดี คือ ถูก แต่ ข้อเสีย คือ ช้า ค่ะ

Breakdown of ข้อดี คือ ถูก แต่ ข้อเสีย คือ ช้า ค่ะ

ค่ะ
polite particle (female)
ถูก
cheap
แต่
but
ช้า
slow
คือ
is / namely / that is
ข้อดี
advantage
ข้อเสีย
disadvantage

Questions & Answers about ข้อดี คือ ถูก แต่ ข้อเสีย คือ ช้า ค่ะ

Why is คือ used here instead of เป็น for the word 'is'?
While both mean 'to be', เป็น usually tells you what category a noun belongs to (like 'He is a teacher'). คือ is used to give a definition or explanation, meaning 'namely' or 'that is to say'. In this sentence, you are explaining exactly what the advantage and disadvantage are, so คือ is the right choice.
I learned we don't use 'to be' verbs with adjectives in Thai. Why is คือ used before ถูก (cheap) and ช้า (slow)?
You are right that in normal descriptions like 'The car is slow' you just put the noun and adjective together without an 'is' verb. However, in this sentence structure, คือ acts like an equals sign. It isn't describing the advantage, it is introducing the concept that defines it. You are saying 'The good point equals: cheap'.
How do ข้อดี and ข้อเสีย literally translate?
The word ข้อ is used for an item, a point, or a clause. ดี means good and เสีย means bad, broken, or spoiled. So ข้อดี literally means 'good point' and ข้อเสีย means 'bad point'.
Wait, doesn't ถูก also mean 'correct'?
Yes, it does! ถูก is a very common word that can mean either 'cheap' or 'correct' depending on the context. Here, because it is an advantage being contrasted with a service feature like being slow (ช้า), 'cheap' makes the most logical sense.

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