Modal Verbs: Obligation, necessity and permission.
Must and musnÂ´t Strong Obligation
Must and musn´t Must *Affirmative form: Subject +must + verb (inf) + complement Examples: - You must go - You must visit us soon
Mustn´t *Negative form: subject + mustn´t + verb (inf) + complement Examples: - You mustn´t go to that meeting. -We musn´t be late
Interrogative form Must + subject + verb (inf) + complement? Examples: - Must you live now? - Must you travel to Barcelona tomorrow?
Must and mustnÂ´t â—? Must is used to talk about strong obligations in the present and future that are imposed by the speaker. â—? The negative form of "must" expresses the idea that something is prohibitied.
Should, Shouldn't and Ought to Weak Obligation.
Should and Shouldn't Should
*Affirmative form: Subject + should + verb (inf) + complement
*Negative form: subject + shouldn't + verb (inf) + complement
Examples: - (You look tired) You should take a nap. - I should study for tomorrow's test.
Examples: - You shouldn't run in the hallways - You shouldn't have talk to him like that.
Interrogative form Should + subject + verb (inf) + complement? Examples: - Should I talk to him? -Yes, you should -No, you shouldn't
- Should I tell Mary about it? - Yes, you should - No you shouldn't
Should and Shouldn't ● Give suggestion on what is the right thing for somebody to do. ● Give advise or talk about what we think is right or wrong. ● Make orders and instructions more polite
Ought to *Affirmative form: Subject + ought to + verb (inf) + complement Example: -You ought to drive carefully -You ought to clean your room before you leave. *Hardly ever used in negative form: Subject + ought not/oughtn't to + verb (inf) + complement Example: -We ought not/oughtn't to have agreed without knowing what it would cost. *NOT USED in interrogative form.
Differences Ought to
● You suggest someone what is one of the last options one has or something that one can't easily avoid, for example, any longer.
● You suggest someone that something is good to be done or something that after all is meaningful.
● It is more explicit, similiar to a request.
● It is not as explicit as ought to.
Example: -You ought to tell her how you feel. (You can't avoid telling her how you feel)
Example: - You should tell her how you feel. (It is better or the best to tell her how you feel)
Let's practice! Create 3 sentences using "should" and "shouldn't"
Create 3 sentences using "ought to"
Create 3 sentences using "must and mustnÂ´t -
Published on Oct 15, 2011