SHOULD definition: 1. used to say or ask what is the correct or best thing to do: 2. used to show when something is…. Learn more. SHOULD meaning: 1. used to say or ask what is the correct or best thing to do: 2. used to show when something is…. Learn more. SHOULD definition: must; ought (used to indicate duty, propriety, or expediency). See examples of should used in a sentence. The meaning of SHOULD is —used in auxiliary function to express condition —usually used with if. How to use should in a sentence. should (third-person singular simple present should, no present participle, no simple past or past participle) (modal, auxiliary, defective) Ought to; indicating opinion, advice, or instruction, about what is required or desirable. Used to issue an instruction (traditionally seen as carrying less force of authority than alternatives such as 'shall' or 'must'). We use the English model verb should in a few different situations. We very often use it when we give advice: For example, If you often get headaches, you should go to the doctor. If you want to improve your English, you should take English classes. SHOULD is a modal auxiliary verb. We use SHOULD mainly to: 1) give advice, make recommendations 2) talk about obligation 3) talk about probability, expectation 4) express conditional mood 5) replace subjunctive structure Should, shouldn't. Modal verbs. A2. Pre-intermediate English grammar and exercises. We use the verb 'should', 'shouldn't' to give somebody advice. The modals of advice should, ought to, and had better — complete grammar guide covering forms, uses, differences, and common mistakes. With examples and tips for B1–B2 learners. Define should. should synonyms, should pronunciation, should translation, English dictionary definition of should. aux.v. Past tense of shall 1. Used to express obligation or duty: You should send her a note. 2. Used to express probability or expectation: They should.