新概念英语第三册-Lesson 39（课文3）

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4.We felt sure that sooner or later a stone would rip a hole in our petrol tank or damage the engine.
sooner or later  迟早,作时间状语.
Ex
If you drive like that, sooner or later you'll have an accident.
5.Because of this, we kept looking back, wondering if we were leaving a trail of oil and petrol behind us.
keep doing sth: 除表示连续不断的动作或持续状态外,还表示反复发生的动作.
look back 回头看  wondering 从句做伴随状况状语
6.What a relief it was when the boulders suddenly disappeared, giving way to a stretch of plain where the only obstacles were clumps of bushes.   What 感叹词
give way to 为......所代替. 现在分词作结果状语.
Ex
The great clouds gradually broke up and give way to blue sky.
7.But there was worse to come.
worse为名词."更糟糕的事情".
to come 动词不定式作定语.修饰worse