That depends on the sentence.
Does your brother enjoy fishing?
Do your parents enjoy fishing?
it should not be used in any country
A skateboard should be used by pushing hard on the ground.
yes they should be used in class
The choice between "should has" and "should have" depends on the subject of the sentence. "Should have" is the correct form used with all subjects (e.g., I should have, you should have, he/she/it should have). "Should has" is grammatically incorrect and should not be used. Always opt for "should have" in your sentences.
Pickles should not be only used on sandwiches.
it should be used for the care of your screen from harmful uv rays
no they should not
If a drug has expired, it is in a condition and should not be used.
the, an, a when these articles be used
yes it should be used in all netball games
it should be used when someone is ether sick or has an injury which is bleeding
Signposts should be used as often as possible where necessary.