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must be finished must finish must finished must being finished
must be must have been must live must have lived in
stated writed illustrated declared
The coolant temperature must be maintained at 180 ℃ The thermostatic bypass valves must be manually opened before the engine is started The pressure cap must be removed while the engine is secured Electrical power to the heater must be secured before the cooling system is drained
must see;for a moment must have seen; for a moment must see;for the moment must have seen; for the moment
must be must have been must live must have lived in
stated writed illustrated declared
Make sure that the windows are shut To make sure that the windows are shut Making sure to shut the windows To be sure to shut the windows
must see ; for a moment must have seen ; for a moment must see ; for the moment must have seen ; for the moment
must clean may cleaning must be cleaned should be cleaning
must be must live must have been must have lived in
must be must have been must live must have lived
Make sure that the windows are shut To make sure that the windows are shut Making sure to shut the windows To be sure to shut the windows
refrigerant must be bled off the sensing line before adjustments are made all refrigerant must be pumped into the receiver before adjustments are made time must be allowed for conditions to stabilize in the evaporator before furtheradjustments are made all refrigerant must be routed through the dehydrator while changing the superheatsetting
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