回答

・It's about to rain.
・It seems to become raining.
・It is likely to rain.

好像快下雨了。
【It's about to rain. 】
【It seems to become raining. 】
【It is likely to rain. 】

be about to do something 即將、正要～
範例）I was about to call you. 我正想打電話給你。

seem = 似乎、彷彿～
例）You seem so sad today. 你今天看起來很悲傷。

be likely to do something = 可能會（做）～
I likely to forget, please write it down. 我覺得我可能會忘記，你能寫下來嗎？
　

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回答

・It's likely to rain.
・It will rain.
・It's going to rain.

有各種英語表達能傳達快要下雨的意思，
根據下雨的機率不同，使用的單字也會有所不同。

It might rain.　這句話是說不定會下雨的意思
It may rain.　有可能會下雨 (代表也有可能不會下)
It's likely to rain.　感覺好像快要下雨了
It will rain.　這是差不多要下雨的感覺
It's going to rain.　這句話能表達必定將會下雨的意思

It's getting cloudy and the sky is getting dark.
雲越來越多，天色越來越陰暗了。
It's likely to rain.
好像快下雨了呢。

有幫助｜0