It (look) as if this light (burn) all night.
My task is to put the verbs into the correct tense.
My answer is the present simple and the past continuous. However, the key suggests the present perfect continuous. I wonder whether it is a matter of how I perceive 'all night' (finished action) or there is a grammatical reason.
There are two solutions. It looks as if this light has been burning all night. (present, perhaps the light is still on or just turned off) It looked as if this light had been burning all night.
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There are two solutions.
It looks as if this light has been burning all night. (present, perhaps the light is still on or just turned off)
It looked as if this light had been burning all night. (past)