Preposition

[R&R]

Hi all,

Please advise & explain whether appropriate prepositions being used correctly for the following sentences:

1 a) Our pet dog has been missing for the past three days.
1 b) Our pet dog has been missing since the past three days.

2 a) Aminah has been absent for the last two days.
2 b) Aminah has been absent since the last two days.

Appreciate your assistance. Thank you.

[Clark]

Hi all,

Please advise & explain whether appropriate prepositions being used correctly for the following sentences:

1 a) Our pet dog has been missing for the past three days. (correct)
1 b) Our pet dog has been missing since the past three days. (incorrect)

2 a) Aminah has been absent for the last two days. (correct)
2 b) Aminah has been absent since the last two days. (incorrect)

Appreciate your assistance. Thank you.

'For' indicates the duration of an action.
'Since' indicates the starting point of an action.