Model Verbs - Coggle Diagram
Replace "will" in the question
Ask for some opinions
Replace "Shall" in the past
Predict for the future to show the wanting of the speaker
Replace "will" in the past
Predict in the past with almost sure:
S+Must have done+ O
Less than "Must"
In (-), "Have to"- "Must" are replaced by
Lower the properties (feature) of "must"
Must I do it right now? --> No, you needn't. You can do it tomorrow
In (+), "need" -> "need(s) to V"
"Need" only with (-)
He daren't tell the truth
DARE or NEED can act as a "model V" or "main V"
Lower than "Should"
Past: Describe an advice that represent for blaming
S+ ought to have done+ O
Predict in the past
Can/ Might (not)+ have been done+ O