Question

2) Use since ou for:

a) They have been sick ________ two days.
b) He has waited for me ________ midday.
c) I have lived in Chicago ________ 1993.
d) You have worked for the post Office _________ seven months.

Answer 1

Since é semelhante a "desde", e for é semelhante a "por" em português, logo:
a) for
b) since
c) since
d) for

Answer 2

Olá

a) They have been sick for two days.
b) He has waited for me since midday.
c) I have lived in Chicago since 1993.
d) You have worked for the post Office for seven months.

Espero ter ajudado
Bons estudos!