Under no circumstances should "a mere cold in the eyes" be neglected; it may result in blindness.
Under no circumstances should a midwife be engaged.
The success of all normal weanings is due entirely to the fact that it is done gradually and slowly, and under no circumstances should it be roughly and abruptly attempted--particularly in case of the bottle feeding.
The treatment of soldiers should be uniform and just, and under no circumstances should a man be humiliated unnecessarily or abused.
He dispatched two regiments to Peekskill, on the Hudson, and had his whole army in readiness to march in that direction, if circumstances should require.
They had come together from distant provinces, some instructed by the power that appointed them, others left free to act as circumstances should require.
He immediately sent a message to Sir Henry Clinton, who was left in command at New York, to act in conjunction with Burgoyne, if circumstances should permit.
Napkins should be changed when soiled, and then should be immediately placed in water, in which they should remain until washed out; under no circumstances should they be left lying around the nursery.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "circumstances should" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.