Tag: leadership

'Since' is correct because it marks the beginning of a continuing action (1980) that continues to the present. The present perfect 'have bloomed' requires 'since' + point in time, not 'for' + duration. 'After' would change the meaning.

The phrase 'that time' refers to a specific point in the past. 'Since' is the correct preposition to indicate the starting point of a state that persists. 'For' is used for lengths of time, which 'that time' does not represent here.

The word 'since' is used to mark the beginning of a period that continues to the present. 'Last week' is a specific point in time, which requires 'since' in the present perfect tense. 'For' is incorrect because 'last week' is not a duration.

In this context, 'after' is a preposition of time indicating that the action of going home occurred following the conclusion of the school day. 'For' and 'since' do not make logical sense in this simple past construction describing a sequence of events.

The preposition 'since' is used with the present perfect tense to refer to a specific point in time (yesterday) when an action or state began. 'For' would require a duration (e.g., for two days), making 'since' the only correct choice.

The preposition 'for' is used to indicate a duration or period of time (more than three years). 'Since' is used for a specific starting point in time, and 'after' does not fit the grammatical structure of the present perfect negative used here.

In English, 'for' is the correct preposition to use with a duration of time like 'a long time'. 'Since' requires a specific point in time (e.g., 'since 2010').

The preposition 'for' is used to indicate a duration of time ('three weeks'). 'Since' is used for a specific point in time, making it incorrect in this context.

'For' is correct with duration phrases like 'many years' when describing how long an action has continued. 'Since' would require a specific starting point (a date or year), not a duration. 'After' would change the meaning.