在英语中，"外出多乘公交"可以用以下表达来表示：

Take the bus frequently when going out
Use the bus often when going out
Take pubpc transportation frequently when going out
Use pubpc transportation often when going out

这些表达方式均来自于英语的常用语法，其中"take"和"use"都可以表示"乘坐"的意思，"the bus"和"pubpc transportation"都可以表示"公交车"的意思，"frequently"和"often"都可以表示"常常"的意思，"when going out"表示"外出时"的意思。

下面是一些使用这些表达的英文例句及其中文翻译：

I take the bus frequently when going out because it's cheaper than driving.
我外出时常常乘坐公交车，因为它比开车便宜。
My friend uses the bus often when going out because it's more environmentally friendly.
我的朋友外出时常常乘坐公交车，因为它更环保。
I take pubpc transportation frequently when going out because it's convenient.
我外出时常常乘坐公共交通工具，因为它很方便。
My sister uses pubpc transportation often when going out because it saves her time.
我的妹妹外出时常常乘坐公共交通工具，因为它能节省她的时间。