英文文法的問題~

(1)Can I contact you with e-mail?
A singular noun to a singular noun is ok.
(2)Can we contact (each other) with e-mail?
"each other "used here as the object of (verb)contact to show that each of a group does something for the other in the "contact with e-mail."

May I contact you by e-mail?
(more formal; used for politely asking someone to let you do something)

Could I contact you by e-mail?
(used in polite request)

不是 with e-mail, 是 by e-mail

Contact (v) = 聯絡
To write to, phone or email someone especially for the first time, in order to give or ask information. (其中一個意思)

Correspond (v) = 通信
(Formal) If two people correspond, they regularly write letters to each other.

Communicate (v) = 通訊, 通信
Can we communicate with each other via e-mail?

我想 correspond 和 communicate 比較不適合, 解 "通信"
書信來來往往, 比較熟落, 朋友, 同事, 同學, 師生, 老板員工 熟客戶 … etc

如果係禮貌地詢問請用
May I或Could I
用Can I是比較老實不客氣的問可否
另外不是with e-mail係by e-mail

Can I contact you by e-mail?
May I contact you by e-mail?
Could we correspond through e-mail?