How do we form the *THE PASSIVE (PRESENT*
Present simple (To be) + Present perfect (OV)
Strong obligation
Must + infinitive
How do we form the *PRESENT CONTINOUS*
Present simple (to be)+ ger (ing) verb
We use the ... for the short action
Past simple
We use the ... with ... for the longer action that is interrupted
Past continous/while
How do we form the *PRESENT PERFECT*
Present simple (to have) + Past participle (OV)
How do we form the *PAST PERFECT*
Past simple (to have) + Past participle
Lack of obligation
Do not + have to + infinitive.
How do we for an obligation
Have to + infinitive