Tag: past
Modal Verbs: could
Could can be used with the indefinite infinitive to express past actions. When using could in this way, it usually indicates ability or possibility in the past.
Modal Verbs: must
Must with the indefinite infinitive is used in the present to express a strong obligation, necessity or deduction. Examples: I must study for my exam. (strong obligation)
Auxiliary Verbs: to have
Have got is another form of the verb have that can be used as a main verb or an auxiliary verb.
Auxiliary Verbs: to be
To be is used with the present participle (ing form) of the main verb to indicate an action that is currently happening. Example: She is studying for her exam.
The Future Perfect Continuous in the Past
The Future Perfect Continuous in the Past is a tense used to talk about an ongoing action that was expected to be completed at a specific point in the past. It is formed using the past participle of will have been (which is would have been) and the present participle form (-ing) of the main verb.