想同我講英文...應該係用and I speak english定 with I speak english

Both "and I speak English" and "with I speak English" are wrong.

The correct way to say it is either :

I'd like to talk to you in English; or

I'd like to converse with you in English.

Hope this will help you out.

Speak English with me. and 是沒有人用的。

you should say "Speak English with me"

係講「can you speak english with me.」