Used to form the future tense of the subjunctive mood, usually in the first person. "If I should be late, go without me." Used to indicate that an action is considered by the speaker to be obligatory.

What kind of word is should?

Should is an auxiliary verb - a modal auxiliary verb. We use should mainly to: give advice or make recommendations. talk about obligation.

When should we use the word should?

Should is used to say that something is the proper or best thing to do, or to say that someone ought to do something or must do something. Adam could visit us on Monday. This tells us that it is possible Adam will visit on Monday, maybe he can visit us, but maybe he has other options, too.