1. The helicopters are always flying in the sky.
2. The helicopters always fly in the sky.
In which situation can I use the two sentences above?
Never - they are unnatural. Delete 'in the sky': they can't fly anywhere else. Here are some natural sentences: The police helicopter has been flying over our house a lot lately.
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Never - they are unnatural.
Delete 'in the sky': they can't fly anywhere else.
Here are some natural sentences:
The police helicopter has been flying over our house a lot lately.
The TV stations' helicopters soon arrive and hover over accident scenes or chase fugitive vehicles from the air.
The air ambulance helicopter regularly flies severely inj