Tag: softskills

'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.

The preposition 'for' is used to indicate the length of a period of time ('two days'). 'Since' would be used for a specific start time, like 'since Monday'.

The word 'since' is used as a conjunction to introduce a clause describing the starting point of a state that continues to the present. 'For' cannot be used to introduce a clause with a subject and verb.

The preposition 'for' is used to describe a duration of time ('ten years'). 'Since' is incorrect here because 'ten years' is a length of time, not a specific calendar date or event.

'Since' is correct because it marks the point in time (when he was elected) from which the action continues. 'New ideas have been put into practice' (present perfect) + starting point requires 'since'. 'For' would need a duration.

The preposition 'since' is used to refer to a specific point in time (noon) when an action started and continues to the present. 'For' would require a duration (e.g., 'for two hours').

The preposition 'for' is used to indicate a duration or period of time (e.g., 'quite a long time'). 'Since' is used for a specific starting point in time, which does not apply here.

'Since' is correct because it marks the starting point (early this morning) of an action continuing to the present. 'He's been working' (present perfect continuous) requires 'since' + point in time. 'For' would need a duration like 'for 6 hours'.

This is a logic puzzle. C sees two hats; if they were the same, C would know his own. Since C is silent, the hats on A and B must be different. B, seeing A's hat and knowing C is silent, deduces his hat must be the opposite of A's.

Working backwards: if 1 mango remains after 3rd guard, before 3rd guard he had (1+1)×2=4. Before 2nd guard: (4+1)×2=10. Before 1st guard: (10+1)×2=22. Each guard takes half+1, so reverse is add 1 then double. 22 is the starting amount.