when a shark ______ (appear),a bell rings will tell the people to get out of the water

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whenashark______(appear),abellringswilltellthepeopletogetoutofthewaterwhenashark______(appear),abell

when a shark ______ (appear),a bell rings will tell the people to get out of the water
when a shark ______ (appear),a bell rings will tell the people to get out of the water

when a shark ______ (appear),a bell rings will tell the people to get out of the water
when a shark (appear),a bell rings will tell the people to get out of the water
条件状语从句主句是一般将来时,从句用一般现在时.

is appearing

when a shark appwars(appear),a bell rings will tell the people to get out of the water
当一只鲨鱼出现的时候,铃声将会响起告诉人们是时候离开水面

appears.
用一般现在时.