た ほうがいい

When giving advice this is useful.  

CONSTRUCTION: ta form (#3) + ほう　が　いい　hou ga ii

休んだ　ほう　が　いい。
yasunda hou ga ii.
It would be better to rest.

聞いた　ほう　が　いい。
kiita hou ga ii.
It would be better to ask (someone).

NOTE: The ta form is the same as the past tense. (But obviously it is not past here)