1.You may either stay at home or go with us.
either...or...表示两者选其一,类似的搭配：
both...and...两者都
neither...nor...两者都不
2.You ought not to eat or drink while you are walking down the street.
ought to do 应当做...
while 表示一动作伴随另一动作同时进行时一般用现在进行时