The main verb can never be the to-infinitive. We cannot say: He should to go. There is no short form for should, but we can shorten the negative should not to shouldn't. 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 (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. The meaning of SHOULD is —used in auxiliary function to express condition —usually used with if. How to use should in a sentence. 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. Learn how to use the English verbs should, must, and ought to. Get clear, simple grammar advice from expert English teachers at the British Council. Usage: Should has, as its most common meaning in modern English, the sense ought as in I should go to the graduation, but I don't see how I can. However, the older sense of the subjunctive of shall is often used with I or we to indicate a more polite form than would: I should like to go, but I can't. SHOULD definition: must; ought (used to indicate duty, propriety, or expediency). See examples of should used in a sentence. Should is a modal verb, and all modal verbs are followed by an infinitive (without to). You should to listen to me. You should listen to me. The negative form of should is should not or shouldn’t. You should not be here. = You shouldn’t be here. To ask questions, we use should + subject + infinitive. We don’t use the verb do to ask questions. This post gives you a complete reference guide to should, ought to, and had better with clear rules, examples, and tips to help you avoid the most common mistakes.