地面是湿的，昨晚肯定下过雨了。
The ground is wet — it must have rained last night.
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must英 /mʌst/|美 /mʌst/
have英 /əv/|美 /əv/
rained英 /reɪnd/|美 /reɪnd/
解释
must + have + 过去分词 rained，根据地面湿的物理证据做肯定推测。用 it 作主语指天气，覆盖非人称主语场景。
The ground is wet — it must have rained last night.
must + have + 过去分词 rained，根据地面湿的物理证据做肯定推测。用 it 作主语指天气，覆盖非人称主语场景。