Tenses

Planned future actions or possible future events

Step 1: Simple Future Tense uses will/shall + base form of verb. Step 2: It expresses actions that will happen in the future. Step 3: Examples include planned actions ('I will visit my grandmother') and predictions ('It will rain tomorrow'). Step 4: Option A describes Present Continuous, Option B describes Simple Past, and Option D describes Simple Present. Step 5: Therefore, Simple Future expresses planned future actions or possible future events.

Past Perfect Continuous

Step 1: Identify the structure 'had been + studying' (verb+ing). Step 2: Past Perfect Continuous uses 'had been + -ing form of verb'. Step 3: It shows an action that started before a certain point in the past and continued until that time. Step 4: 'She had been studying for two hours when I called her' shows studying started before the call and continued until the call. Step 5: Therefore, this sentence uses Past Perfect Continuous Tense.

'Since' for starting points, 'For' for time periods

Step 1: 'Since' indicates the beginning point of an action (since morning, since 2020). Step 2: 'For' indicates the duration or time period (for two hours, for three years). Step 3: Example with 'since': 'I have not eaten since last evening' (starting point). Step 4: Example with 'for': 'He has been working for six years' (time period). Step 5: Therefore, 'since' is for starting points and 'for' is for time periods.

subject + will have + past participle

Step 1: Future Perfect Tense shows actions completed before a certain time in the future. Step 2: The structure is subject + will/shall + have + past participle. Step 3: Example: 'She will have finished the work by evening.' Step 4: Option A is Simple Future, Option B is Future Continuous, Option D is Future Perfect Continuous. Step 5: Therefore, the correct structure is 'subject + will have + past participle'.