How is 'had to' used for past obligation?

Modal verbs are auxiliaries, or "helping" verbs: they are used in conjunction with another verb (in infinitive form) as a way to modify its meaning. Jun 1, 2013 ... When we want to express permission, prohibition (not allowing something), obligation or no obligation we use modal verbs. Modal verbs almost always accompany the base (infinitive) form of another verb using this simple formula: modal + (not) + verb. For example: She could sing very ... Modal verbs do not take any endings like -s, -ed or -ing · It might rain tonight. · The negative form of may is may not + base form. · When may is used in a ... Feb 19, 2023 ... How to Use Modal Verbs. This infographic explains 10 modal verbs and their usages with useful examples. Jun 4, 2024 ... Understanding how to use modal verbs correctly can significantly enhance your English communication skills, whether you are writing or speaking. Oct 2, 2024 ... Modal verbs are commonly used to express the possibility or probability of an event or action. They show how likely or unlikely it is from the ... Surprisingly little is known about the use of modal auxiliaries by children with specific language impairment (SLI). These forms fall within the category of ... Feb 21, 2020 ... English modal verbs include can, could, may, might, must, shall, should, will, and would. They are primarily used when showing something is certain, possible, ... In academic writing, writers may need to be cautious in the way they present ideas (this is known as hedging). One way of expressing uncertainty is to use the ...