My suggestion is that we (should) walk home instead of taking a taxi.
as if, as though引导的表语从句中用虚拟语气
It looks as if he were intoxicated.好像喝多了
The pencil seems as though it were broken when it is partly put in the water.
We have not seen each other for ten solid years, but when we encountered on the street that day, we were still so affectionate that it seemed as if not a single day had gone by.好像一天都没过去一样
as if/as though也可引导事实或很大可能是事实的从句， 常用在look, seem, taste, smell, sound等系动词后。
