Breakdown of กระแสน้ำ ค่อยๆ กัดเซาะ พื้นผิว หิน จนกระทั่ง กลายเป็น ถ้ำ
หิน
rock
ค่อยๆ
slowly
ถ้ำ
cave
กลายเป็น
to turn into / to become
กระแสน้ำ
water current
กัดเซาะ
to erode
พื้นผิว
surface
จนกระทั่ง
up until the point that
Questions & Answers about กระแสน้ำ ค่อยๆ กัดเซาะ พื้นผิว หิน จนกระทั่ง กลายเป็น ถ้ำ
How does จนกระทั่ง work here, and is it different from just using จน?
จนกระทั่ง is an emphatic form of จน (until). It emphasizes a longer duration of time or effort leading up to a final result, which fits perfectly here to describe the slow process of water eroding rock. While both can often be used interchangeably, จนกระทั่ง sounds slightly more formal and adds a stronger emphasis on "finally reaching the point that" something happens.
Why is ค่อยๆ placed right before the verb กัดเซาะ? Can it go at the end of the sentence?
ค่อยๆ means "gradually" or "slowly." In Thai, adverbs of manner like this often go directly in front of the verb they modify (so, gradually erode = ค่อยๆ กัดเซาะ). You shouldn't place it at the very end of this sentence because the sentence focuses on a process that causes a result; the adverb belongs specifically with the action of the water current.
How is the word for "water current" (กระแสน้ำ) constructed?
It is a compound of กระแส (current, flow, or trend) and น้ำ (water). You will see กระแส used as a prefix for many other flowing things, such as กระแสลม for wind currents, or even abstract concepts like social trends.
Why isn't there a word for "it" before กลายเป็น?
Thai frequently drops pronouns when they are obvious from the context. In a sentence connected by จนกระทั่ง, the subordinate clause doesn't need a new subject if it's logically carrying over from the main clause. Here, the rock surface (พื้นผิวหิน) is clearly the thing transforming into a cave, so adding a pronoun like มัน (it) before กลายเป็น is unnecessary.
What is the difference between กลายเป็น and just เป็น here?
กลายเป็น specifically means "to turn into" or "to transform into." It implies a complete physical or metaphorical change of state. Since the sentence describes rock completely changing its shape to become a cave, กลายเป็น is the perfect choice. Just using เป็น (to be / to serve as) would sound unnatural because it lacks the idea of transformation.
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