As I was walking along the beach ,I noticed a fishing boat _
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As I was walking along the beach ,I noticed a fishing boat _______(sink)

为什么要用sinking而不是were sinking

->因为前面有notice,notice doing 注意到渔船正在沉 其实用was sinking也可以,只是没有前面那个好

Then I smelt something ____(burn)为什么用burning而不是were burning

闻到有个东西正在烧 doing 强调连续性和进行性,根据句意“我闻到某东西正在燃烧”,很明显burning.

and saw smoke 【coming】 under the door

come表示出来