Fill in the blank: 'You ___ obey your parents.'

'must'

Describe the usage of 'should' in giving advice.

'Should' is used to suggest actions that are advisable or recommended, such as 'You should consult a doctor' or 'You should pay your taxes.'

True or False: 'Must' has a past tense form.

False. 'Must' does not have a past tense form.

What is the purpose of the modal verb 'ought to'?

'Ought to' is used to express what is considered the right or sensible action to take, as well as expectations about future events.

Fill in the blanks: 'He ___ to work harder if he wants to succeed.'

'ought'

How does 'need' function differently in questions and negatives?

'Need' is primarily used in questions and negatives without 'do', such as 'Need I go now?' and 'You need not go.'

Provide an example of how 'have to' is used in the past tense.

'Had to' is used to express past obligations, such as 'He had to finish his work before 5 p.m.'

Explain the meaning of 'must not' and give an example.

'Must not' indicates prohibition, as in 'You must not smoke in the hospital.'

Fill in the blank: 'You ___ go to the party if you feel sick.'

'need not'

How is 'should' used to express hypothetical situations?

'Should' can indicate imaginary results or recommendations in hypothetical situations, such as 'He should get angry if he finds out.'