Please read these sentences below.
a. If anyone should call on me during my absence, ask him to wait.
b. If anyone calls one me during my absence, ask him to wait.
I think...a. sounds like...the speaker is pretty sure that...nobody will call on him/her. Am I correct in saying this?
c. Can you open the window?
d. Will you open the window?
I understand these sentences are used as a 'request.'
Is OK for non-native speakers to use these expressions? Well...I mean...
are they appropriate when making a request?
(I know 'Could you...?' or 'Would you...?' would be more appropriate.)
Which would you think is more polite? (Or...probably not polite at all...)
Please give me some advice.
Thank you in advance!